diff --git a/compensation/forms/forms.py b/compensation/forms/forms.py
index dbd3c6c..0970daa 100644
--- a/compensation/forms/forms.py
+++ b/compensation/forms/forms.py
@@ -6,7 +6,7 @@ Created on: 04.12.20
 
 """
 from dal import autocomplete
-from django.contrib.auth.models import User
+from user.models import User
 from django.db import transaction
 from django.urls import reverse_lazy, reverse
 from django.utils.translation import gettext_lazy as _
diff --git a/compensation/models/compensation.py b/compensation/models/compensation.py
index 65a62b6..b68ad10 100644
--- a/compensation/models/compensation.py
+++ b/compensation/models/compensation.py
@@ -8,7 +8,7 @@ Created on: 16.11.21
 import shutil
 
 from django.contrib import messages
-from django.contrib.auth.models import User
+from user.models import User
 from django.db import models, transaction
 from django.db.models import QuerySet, Sum
 from django.http import HttpRequest
diff --git a/compensation/models/eco_account.py b/compensation/models/eco_account.py
index dad7bff..7d339b4 100644
--- a/compensation/models/eco_account.py
+++ b/compensation/models/eco_account.py
@@ -7,7 +7,7 @@ Created on: 16.11.21
 """
 import shutil
 
-from django.contrib.auth.models import User
+from user.models import User
 from django.core.exceptions import ValidationError
 from django.core.validators import MinValueValidator
 from django.db import models, transaction
diff --git a/compensation/tables.py b/compensation/tables.py
index 6e6a190..9daf2b2 100644
--- a/compensation/tables.py
+++ b/compensation/tables.py
@@ -5,7 +5,7 @@ Contact: michel.peltriaux@sgdnord.rlp.de
 Created on: 01.12.20
 
 """
-from django.contrib.auth.models import User
+from user.models import User
 from django.http import HttpRequest
 from django.template.loader import render_to_string
 from django.urls import reverse
diff --git a/compensation/utils/quality.py b/compensation/utils/quality.py
index b7f8daa..b622fcd 100644
--- a/compensation/utils/quality.py
+++ b/compensation/utils/quality.py
@@ -58,20 +58,8 @@ class EcoAccountQualityChecker(CompensationQualityChecker):
         self._check_deductable_surface()
         self._check_responsible_data()
         self._check_legal_data()
-        self._check_record_state()
         super().run_check()
 
-    def _check_record_state(self):
-        """ Checks the data quality for recorded state
-
-        Returns:
-
-        """
-        if self.obj.recorded is None:
-            self.messages.append(
-                _("Not recorded")
-            )
-
     def _check_legal_data(self):
         """ Checks the data quality for Legal
 
diff --git a/ema/forms.py b/ema/forms.py
index cb7f0cc..5dc3bcf 100644
--- a/ema/forms.py
+++ b/ema/forms.py
@@ -7,7 +7,7 @@ Created on: 06.10.21
 """
 from dal import autocomplete
 from django import forms
-from django.contrib.auth.models import User
+from user.models import User
 from django.db import transaction
 from django.urls import reverse, reverse_lazy
 from django.utils.translation import gettext_lazy as _
diff --git a/intervention/forms/forms.py b/intervention/forms/forms.py
index 5340dd6..6f09815 100644
--- a/intervention/forms/forms.py
+++ b/intervention/forms/forms.py
@@ -7,7 +7,7 @@ Created on: 02.12.20
 """
 from dal import autocomplete
 from django import forms
-from django.contrib.auth.models import User
+from user.models import User
 from django.db import transaction
 from django.urls import reverse, reverse_lazy
 from django.utils.translation import gettext_lazy as _
diff --git a/intervention/forms/modalForms.py b/intervention/forms/modalForms.py
index aea9f2c..063a912 100644
--- a/intervention/forms/modalForms.py
+++ b/intervention/forms/modalForms.py
@@ -6,7 +6,7 @@ Created on: 27.09.21
 
 """
 from dal import autocomplete
-from django.contrib.auth.models import User
+from user.models import User
 from django.db import transaction
 from django import forms
 from django.urls import reverse
diff --git a/intervention/models/intervention.py b/intervention/models/intervention.py
index 737dd40..6f72123 100644
--- a/intervention/models/intervention.py
+++ b/intervention/models/intervention.py
@@ -8,7 +8,7 @@ Created on: 15.11.21
 import shutil
 
 from django.contrib import messages
-from django.contrib.auth.models import User
+from user.models import User
 from django.db import models, transaction
 from django.db.models import QuerySet
 from django.http import HttpRequest
diff --git a/konova/autocompletes.py b/konova/autocompletes.py
index f47117c..bee8dad 100644
--- a/konova/autocompletes.py
+++ b/konova/autocompletes.py
@@ -6,7 +6,7 @@ Created on: 07.12.20
 
 """
 from dal_select2.views import Select2QuerySetView, Select2GroupQuerySetView
-from django.contrib.auth.models import User
+from user.models import User
 from django.db.models import Q
 
 from codelist.models import KonovaCode
diff --git a/konova/forms.py b/konova/forms.py
index 4ad309e..aae83e6 100644
--- a/konova/forms.py
+++ b/konova/forms.py
@@ -12,7 +12,7 @@ from bootstrap_modal_forms.forms import BSModalForm
 from bootstrap_modal_forms.utils import is_ajax
 from django import forms
 from django.contrib import messages
-from django.contrib.auth.models import User
+from user.models import User
 from django.contrib.gis.forms import OSMWidget, MultiPolygonField
 from django.contrib.gis.geos import MultiPolygon
 from django.db import transaction
diff --git a/konova/management/commands/setup.py b/konova/management/commands/setup.py
index f02a8e3..6c52ba9 100644
--- a/konova/management/commands/setup.py
+++ b/konova/management/commands/setup.py
@@ -7,7 +7,8 @@ Created on: 15.12.20
 """
 from getpass import getpass
 
-from django.contrib.auth.models import User, Group
+from user.models import User
+from django.contrib.auth.models import Group
 from django.core.management import BaseCommand, call_command
 from django.db import transaction
 
diff --git a/konova/management/commands/setup_data.py b/konova/management/commands/setup_data.py
index 85e6490..4a5683c 100644
--- a/konova/management/commands/setup_data.py
+++ b/konova/management/commands/setup_data.py
@@ -23,10 +23,9 @@ GROUPS_DATA = [
 
 # Must match with UserNotificationEnum
 USER_NOTIFICATIONS_NAMES = {
-    "NOTIFY_ON_NEW_RELATED_DATA": _("On new related data"),
-    "NOTIFY_ON_SHARE_LINK_DISABLED": _("On disabled share link"),
+    "NOTIFY_ON_SHARED_ACCESS_GAINED": _("On shared access gained"),
     "NOTIFY_ON_SHARED_ACCESS_REMOVED": _("On shared access removed"),
     "NOTIFY_ON_SHARED_DATA_RECORDED": _("On shared data recorded"),
     "NOTIFY_ON_SHARED_DATA_DELETED": _("On shared data deleted"),
-    "NOTIFY_ON_REGISTERED_DATA_EDITED": _("On registered data edited"),
+    "NOTIFY_ON_SHARED_DATA_CHECKED": _("On shared data checked"),
 }
\ No newline at end of file
diff --git a/konova/models/object.py b/konova/models/object.py
index 49c1f4e..a27398d 100644
--- a/konova/models/object.py
+++ b/konova/models/object.py
@@ -10,7 +10,11 @@ import uuid
 from abc import abstractmethod
 
 from django.contrib import messages
-from django.contrib.auth.models import User
+
+from konova.tasks import celery_send_mail_shared_access_removed, celery_send_mail_shared_access_given, \
+    celery_send_mail_shared_data_recorded, celery_send_mail_shared_data_unrecorded, \
+    celery_send_mail_shared_data_deleted, celery_send_mail_shared_data_checked
+from user.models import User
 from django.core.exceptions import ObjectDoesNotExist
 from django.http import HttpRequest
 from django.utils.timezone import now
@@ -118,6 +122,12 @@ class BaseObject(BaseResource):
             action = UserActionLogEntry.get_deleted_action(user)
             self.deleted = action
             self.log.add(action)
+
+            # Send mail
+            shared_users = self.users.all().values_list("id", flat=True)
+            for user_id in shared_users:
+                celery_send_mail_shared_data_deleted.delay(self.identifier, user_id)
+
             self.save()
 
     def add_log_entry(self, action: UserAction, user: User, comment: str):
@@ -216,6 +226,11 @@ class RecordableObjectMixin(models.Model):
         self.recorded = None
         self.save()
         self.log.add(action)
+
+        shared_users = self.users.all().values_list("id", flat=True)
+        for user_id in shared_users:
+            celery_send_mail_shared_data_unrecorded(self.identifier, user_id)
+
         return action
 
     def set_recorded(self, user: User):
@@ -233,6 +248,11 @@ class RecordableObjectMixin(models.Model):
         self.recorded = action
         self.save()
         self.log.add(action)
+
+        shared_users = self.users.all().values_list("id", flat=True)
+        for user_id in shared_users:
+            celery_send_mail_shared_data_recorded(self.identifier, user_id)
+
         return action
 
     def mark_as_edited(self, performing_user: User, request: HttpRequest = None, edit_comment: str = None):
@@ -305,6 +325,12 @@ class CheckableObjectMixin(models.Model):
         action = UserActionLogEntry.get_checked_action(user)
         self.checked = action
         self.save()
+
+        # Send mail
+        shared_users = self.users.all().values_list("id", flat=True)
+        for user_id in shared_users:
+            celery_send_mail_shared_data_checked.delay(self.identifier, user_id)
+
         self.log.add(action)
         return action
 
@@ -411,6 +437,17 @@ class ShareableObjectMixin(models.Model):
         users = User.objects.filter(
             id__in=accessing_users
         )
+        removed_users = self.users.all().exclude(
+            id__in=accessing_users
+        ).values("id")
+
+        # Send mails
+        for user in removed_users:
+            celery_send_mail_shared_access_removed.delay(self.identifier, user["id"])
+        for user in new_accessing_users:
+            celery_send_mail_shared_access_given.delay(self.identifier, user)
+
+        # Set new shared users
         self.share_with_list(users)
 
 
diff --git a/konova/sso/sso.py b/konova/sso/sso.py
index 69cd2b3..f33376f 100644
--- a/konova/sso/sso.py
+++ b/konova/sso/sso.py
@@ -5,9 +5,10 @@ Contact: michel.peltriaux@sgdnord.rlp.de
 Created on: 17.08.21
 
 """
-from django.contrib.auth.models import User
 from simple_sso.sso_client.client import Client
 
+from user.models import User
+
 
 class KonovaSSOClient(Client):
     """ Konova specialized derivate of general sso.Client.
diff --git a/konova/sub_settings/django_settings.py b/konova/sub_settings/django_settings.py
index df875a8..bc1a751 100644
--- a/konova/sub_settings/django_settings.py
+++ b/konova/sub_settings/django_settings.py
@@ -129,7 +129,7 @@ DATABASES = {
 
 # Password validation
 # https://docs.djangoproject.com/en/3.1/ref/settings/#auth-password-validators
-
+AUTH_USER_MODEL = "user.User"
 AUTH_PASSWORD_VALIDATORS = [
     {
         'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
@@ -204,9 +204,15 @@ DEBUG_TOOLBAR_CONFIG = {
 }
 
 # EMAIL (see https://docs.djangoproject.com/en/dev/topics/email/)
-DEFAULT_FROM_EMAIL = "bot@arneo.de"  # The default email address for the 'from' element
+
+# CHANGE_ME !!! ONLY FOR DEVELOPMENT !!!
+EMAIL_BACKEND = 'django.core.mail.backends.filebased.EmailBackend'
+EMAIL_FILE_PATH = '/tmp/app-messages' # change this to a proper location
+
+DEFAULT_FROM_EMAIL = "service@ksp.de"  # The default email address for the 'from' element
 EMAIL_HOST = "localhost"
-EMAIL_PORT = "1025"
+EMAIL_REPLY_TO = "ksp-servicestelle@sgdnord.rlp.de"
+EMAIL_PORT = "25"
 #EMAIL_HOST_USER = ""
 #EMAIL_HOST_PASSWORD = ""
 EMAIL_USE_TLS = False
diff --git a/konova/tasks.py b/konova/tasks.py
index b0108a4..a463374 100644
--- a/konova/tasks.py
+++ b/konova/tasks.py
@@ -1,14 +1,60 @@
+from time import sleep
+
 from celery import shared_task
 from django.core.exceptions import ObjectDoesNotExist
 
-from konova.models import Geometry
 
 
 @shared_task
-def celery_update_parcels(geometry_id: str):
+def celery_update_parcels(geometry_id: str, recheck: bool = True):
+    from konova.models import Geometry
     try:
         geom = Geometry.objects.get(id=geometry_id)
         geom.parcels.clear()
         geom.update_parcels()
     except ObjectDoesNotExist:
-        return
+        if recheck:
+            sleep(5)
+            celery_update_parcels(geometry_id, False)
+
+
+@shared_task
+def celery_send_mail_shared_access_removed(obj_identifier, user_id):
+    from user.models import User
+    user = User.objects.get(id=user_id)
+    user.send_mail_shared_access_removed(obj_identifier)
+
+
+@shared_task
+def celery_send_mail_shared_access_given(obj_identifier, user_id):
+    from user.models import User
+    user = User.objects.get(id=user_id)
+    user.send_mail_shared_access_given(obj_identifier)
+
+
+@shared_task
+def celery_send_mail_shared_data_recorded(obj_identifier, user_id):
+    from user.models import User
+    user = User.objects.get(id=user_id)
+    user.send_mail_shared_data_recorded(obj_identifier)
+
+
+@shared_task
+def celery_send_mail_shared_data_unrecorded(obj_identifier, user_id):
+    from user.models import User
+    user = User.objects.get(id=user_id)
+    user.send_mail_shared_data_unrecorded(obj_identifier)
+
+
+@shared_task
+def celery_send_mail_shared_data_deleted(obj_identifier, user_id):
+    from user.models import User
+    user = User.objects.get(id=user_id)
+    user.send_mail_shared_data_deleted(obj_identifier)
+
+
+@shared_task
+def celery_send_mail_shared_data_checked(obj_identifier, user_id):
+    from user.models import User
+    user = User.objects.get(id=user_id)
+    user.send_mail_shared_data_checked(obj_identifier)
diff --git a/konova/tests/test_views.py b/konova/tests/test_views.py
index dad4429..1e0ae7f 100644
--- a/konova/tests/test_views.py
+++ b/konova/tests/test_views.py
@@ -7,7 +7,8 @@ Created on: 26.10.21
 """
 import datetime
 
-from django.contrib.auth.models import User, Group
+from user.models import User
+from django.contrib.auth.models import Group
 from django.contrib.gis.geos import MultiPolygon, Polygon
 from django.core.exceptions import ObjectDoesNotExist
 from django.test import TestCase, Client
diff --git a/konova/utils/mailer.py b/konova/utils/mailer.py
index 0dc32c6..9c273ff 100644
--- a/konova/utils/mailer.py
+++ b/konova/utils/mailer.py
@@ -8,8 +8,10 @@ Created on: 09.11.20
 import logging
 
 from django.core.mail import send_mail
+from django.template.loader import render_to_string
+from django.utils.translation import gettext_lazy as _
 
-from konova.sub_settings.django_settings import DEFAULT_FROM_EMAIL
+from konova.sub_settings.django_settings import DEFAULT_FROM_EMAIL, EMAIL_REPLY_TO
 
 logger = logging.getLogger(__name__)
 
@@ -26,27 +28,156 @@ class Mailer:
     auth_user = None
     auth_password = None
 
-    def __init__(self, to_mail: list, from_mail: str = DEFAULT_FROM_EMAIL, auth_user: str = None, auth_password: str = None, fail_silently: bool = False):
-        # Make sure given to_mail parameter is a list
-        if isinstance(to_mail, str):
-            to_mail = [to_mail]
-
+    def __init__(self, from_mail: str = DEFAULT_FROM_EMAIL, auth_user: str = None, auth_password: str = None, fail_silently: bool = False):
         self.from_mail = from_mail
-        self.to_mail = to_mail
         self.fail_silently = fail_silently
         self.auth_user = auth_user
         self.auth_password = auth_password
 
-    def send(self, subject: str, msg: str):
+    def send(self, recipient_list: list, subject: str, msg: str):
         """
         Sends a mail with subject and message
         """
         return send_mail(
             subject=subject,
-            message=msg,
+            message=None,
+            html_message=msg,
             from_email=self.from_mail,
-            recipient_list=self.to_mail,
+            recipient_list=recipient_list,
             fail_silently=self.fail_silently,
             auth_user=self.auth_user,
             auth_password=self.auth_password
-        )
\ No newline at end of file
+        )
+
+    def send_mail_shared_access_removed(self, obj_identifier, user):
+        """ Send a mail if user has no access to the object anymore
+
+        Args:
+            obj_identifier (str): The object identifier
+
+        Returns:
+
+        """
+        context = {
+            "user": user,
+            "obj_identifier": obj_identifier,
+            "EMAIL_REPLY_TO": EMAIL_REPLY_TO,
+        }
+        msg = render_to_string("email/sharing/shared_access_removed.html", context)
+        user_mail_address = [user.email]
+        self.send(
+            user_mail_address,
+            _("{} - Shared access removed").format(obj_identifier),
+            msg
+        )
+
+    def send_mail_shared_access_given(self, obj_identifier, user):
+        """ Send a mail if user just got access to the object
+
+        Args:
+            obj_identifier (str): The object identifier
+
+        Returns:
+
+        """
+        context = {
+            "user": user,
+            "obj_identifier": obj_identifier,
+            "EMAIL_REPLY_TO": EMAIL_REPLY_TO,
+        }
+        msg = render_to_string("email/sharing/shared_access_given.html", context)
+        user_mail_address = [user.email]
+        self.send(
+            user_mail_address,
+            _("{} - Shared access given").format(obj_identifier),
+            msg
+        )
+
+    def send_mail_shared_data_recorded(self, obj_identifier, user):
+        """ Send a mail if the user's shared data has just been unrecorded
+
+        Args:
+            obj_identifier (str): The object identifier
+
+        Returns:
+
+        """
+        context = {
+            "user": user,
+            "obj_identifier": obj_identifier,
+            "EMAIL_REPLY_TO": EMAIL_REPLY_TO,
+        }
+        msg = render_to_string("email/recording/shared_data_recorded.html", context)
+        user_mail_address = [user.email]
+        self.send(
+            user_mail_address,
+            _("{} - Shared data recorded").format(obj_identifier),
+            msg
+        )
+
+    def send_mail_shared_data_unrecorded(self, obj_identifier, user):
+        """ Send a mail if the user's shared data has just been unrecorded
+
+        Args:
+            obj_identifier (str): The object identifier
+
+        Returns:
+
+        """
+        context = {
+            "user": user,
+            "obj_identifier": obj_identifier,
+            "EMAIL_REPLY_TO": EMAIL_REPLY_TO,
+        }
+        msg = render_to_string("email/recording/shared_data_unrecorded.html", context)
+        user_mail_address = [user.email]
+        self.send(
+            user_mail_address,
+            _("{} - Shared data unrecorded").format(obj_identifier),
+            msg
+        )
+
+    def send_mail_shared_data_deleted(self, obj_identifier, user):
+        """ Send a mail if shared data has just been deleted
+
+        Args:
+            obj_identifier (str): The object identifier
+
+        Returns:
+
+        """
+        context = {
+            "user": user,
+            "obj_identifier": obj_identifier,
+            "EMAIL_REPLY_TO": EMAIL_REPLY_TO,
+        }
+        msg = render_to_string("email/deleting/shared_data_deleted.html", context)
+        user_mail_address = [user.email]
+        self.send(
+            user_mail_address,
+            _("{} - Shared data deleted").format(obj_identifier),
+            msg
+        )
+
+    def send_mail_shared_data_checked(self, obj_identifier, user):
+        """ Send a mail if shared data just has been checked
+
+        Args:
+            obj_identifier (str): The object identifier
+
+        Returns:
+
+        """
+        context = {
+            "user": user,
+            "obj_identifier": obj_identifier,
+            "EMAIL_REPLY_TO": EMAIL_REPLY_TO,
+        }
+        msg = render_to_string("email/checking/shared_data_checked.html", context)
+        user_mail_address = [user.email]
+        self.send(
+            user_mail_address,
+            _("{} - Shared data checked").format(obj_identifier),
+            msg
+        )
+
diff --git a/konova/utils/messenger.py b/konova/utils/messenger.py
index 8169d5e..5be4dc1 100644
--- a/konova/utils/messenger.py
+++ b/konova/utils/messenger.py
@@ -8,7 +8,7 @@ Created on: 17.08.21
 from collections import Iterable
 
 import requests
-from django.contrib.auth.models import User
+from user.models import User
 from django.utils.translation import gettext_lazy as _
 
 from konova.settings import SSO_SERVER_BASE, SSO_PUBLIC_KEY, PROXIES
diff --git a/konova/utils/user_checks.py b/konova/utils/user_checks.py
index a01dadb..b4f6527 100644
--- a/konova/utils/user_checks.py
+++ b/konova/utils/user_checks.py
@@ -5,7 +5,7 @@ Contact: michel.peltriaux@sgdnord.rlp.de
 Created on: 02.07.21
 
 """
-from django.contrib.auth.models import User
+from user.models import User
 
 from konova.settings import ETS_GROUP, ZB_GROUP
 
diff --git a/locale/de/LC_MESSAGES/django.mo b/locale/de/LC_MESSAGES/django.mo
index 1246234..2790b18 100644
Binary files a/locale/de/LC_MESSAGES/django.mo and b/locale/de/LC_MESSAGES/django.mo differ
diff --git a/locale/de/LC_MESSAGES/django.po b/locale/de/LC_MESSAGES/django.po
index cb6b2a8..54fd22a 100644
--- a/locale/de/LC_MESSAGES/django.po
+++ b/locale/de/LC_MESSAGES/django.po
@@ -3,26 +3,30 @@
 # This file is distributed under the same license as the PACKAGE package.
 # FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
 #
-#: compensation/filters.py:91 compensation/forms/modalForms.py:34
+#: compensation/filters.py:122 compensation/forms/modalForms.py:34
 #: compensation/forms/modalForms.py:45 compensation/forms/modalForms.py:61
 #: compensation/forms/modalForms.py:238 compensation/forms/modalForms.py:316
 #: intervention/forms/forms.py:52 intervention/forms/forms.py:154
 #: intervention/forms/forms.py:166 intervention/forms/modalForms.py:125
 #: intervention/forms/modalForms.py:138 intervention/forms/modalForms.py:151
-#: konova/filters.py:63 konova/filters.py:64 konova/filters.py:91
-#: konova/filters.py:92 konova/filters.py:104 konova/filters.py:105
-#: konova/filters.py:117 konova/filters.py:118 konova/filters.py:130
-#: konova/filters.py:131 konova/filters.py:144 konova/filters.py:145
-#: konova/filters.py:280 konova/filters.py:324 konova/forms.py:140
-#: konova/forms.py:241 konova/forms.py:312 konova/forms.py:339
-#: konova/forms.py:349 konova/forms.py:362 konova/forms.py:374
-#: konova/forms.py:392 user/forms.py:38
+#: konova/filters/mixins.py:53 konova/filters/mixins.py:54
+#: konova/filters/mixins.py:81 konova/filters/mixins.py:82
+#: konova/filters/mixins.py:94 konova/filters/mixins.py:95
+#: konova/filters/mixins.py:107 konova/filters/mixins.py:108
+#: konova/filters/mixins.py:120 konova/filters/mixins.py:121
+#: konova/filters/mixins.py:134 konova/filters/mixins.py:135
+#: konova/filters/mixins.py:270 konova/filters/mixins.py:315
+#: konova/filters/mixins.py:353 konova/filters/mixins.py:354
+#: konova/filters/mixins.py:385 konova/filters/mixins.py:386
+#: konova/forms.py:140 konova/forms.py:241 konova/forms.py:312
+#: konova/forms.py:339 konova/forms.py:349 konova/forms.py:362
+#: konova/forms.py:374 konova/forms.py:392 user/forms.py:38
 #, fuzzy
 msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2022-01-11 17:07+0100\n"
+"POT-Creation-Date: 2022-01-12 15:43+0100\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -43,12 +47,12 @@ msgstr "Bis"
 #: analysis/forms.py:47 compensation/forms/forms.py:77
 #: compensation/templates/compensation/detail/eco_account/view.html:58
 #: compensation/templates/compensation/report/eco_account/report.html:16
-#: compensation/utils/quality.py:112 ema/templates/ema/detail/view.html:49
+#: compensation/utils/quality.py:100 ema/templates/ema/detail/view.html:49
 #: ema/templates/ema/report/report.html:16 ema/utils/quality.py:26
 #: intervention/forms/forms.py:100
 #: intervention/templates/intervention/detail/view.html:56
 #: intervention/templates/intervention/report/report.html:37
-#: intervention/utils/quality.py:49
+#: intervention/utils/quality.py:49 konova/filters/mixins.py:395
 msgid "Conservation office"
 msgstr "Eintragungsstelle"
 
@@ -136,7 +140,7 @@ msgstr "Zuständigkeitsbereich"
 #: compensation/templates/compensation/detail/compensation/view.html:63
 #: intervention/tables.py:33
 #: intervention/templates/intervention/detail/view.html:68
-#: user/models/user_action.py:19
+#: user/models/user_action.py:18
 msgid "Checked"
 msgstr "Geprüft"
 
@@ -155,7 +159,7 @@ msgstr "Geprüft"
 #: ema/tables.py:38 ema/templates/ema/detail/view.html:35
 #: intervention/tables.py:39
 #: intervention/templates/intervention/detail/view.html:82
-#: user/models/user_action.py:20
+#: user/models/user_action.py:19
 msgid "Recorded"
 msgstr "Verzeichnet"
 
@@ -301,7 +305,7 @@ msgstr "Altfälle"
 msgid "Before"
 msgstr "Vor"
 
-#: compensation/filters.py:90
+#: compensation/filters.py:121
 msgid "Show only unrecorded"
 msgstr "Nur unverzeichnete anzeigen"
 
@@ -370,7 +374,7 @@ msgstr "Zusätzlicher Kommentar"
 #: compensation/forms/forms.py:93
 #: compensation/templates/compensation/detail/eco_account/view.html:62
 #: compensation/templates/compensation/report/eco_account/report.html:20
-#: compensation/utils/quality.py:114 ema/templates/ema/detail/view.html:53
+#: compensation/utils/quality.py:102 ema/templates/ema/detail/view.html:53
 #: ema/templates/ema/report/report.html:20 ema/utils/quality.py:28
 #: intervention/forms/forms.py:128
 #: intervention/templates/intervention/detail/view.html:60
@@ -430,7 +434,7 @@ msgstr "Neue Kompensation"
 msgid "Edit compensation"
 msgstr "Bearbeite Kompensation"
 
-#: compensation/forms/forms.py:302 compensation/utils/quality.py:96
+#: compensation/forms/forms.py:302 compensation/utils/quality.py:84
 msgid "Available Surface"
 msgstr "Verfügbare Fläche"
 
@@ -440,7 +444,7 @@ msgstr "Die für Abbuchungen zur Verfügung stehende Menge"
 
 #: compensation/forms/forms.py:314
 #: compensation/templates/compensation/detail/eco_account/view.html:66
-#: compensation/utils/quality.py:84
+#: compensation/utils/quality.py:72
 msgid "Agreement date"
 msgstr "Vereinbarungsdatum"
 
@@ -958,7 +962,7 @@ msgstr "Eingriffskennung"
 
 #: compensation/templates/compensation/detail/eco_account/includes/deductions.html:37
 #: intervention/templates/intervention/detail/includes/deductions.html:34
-#: user/models/user_action.py:22
+#: user/models/user_action.py:21
 msgid "Created"
 msgstr "Erstellt"
 
@@ -1036,21 +1040,17 @@ msgstr "-"
 msgid "States unequal"
 msgstr "Ungleiche Zustandsflächenmengen"
 
-#: compensation/utils/quality.py:72
-msgid "Not recorded"
-msgstr "Noch nicht verzeichnet"
-
-#: compensation/utils/quality.py:86 intervention/utils/quality.py:84
+#: compensation/utils/quality.py:74 intervention/utils/quality.py:84
 msgid "Legal data"
 msgstr "Rechtliche Daten"
 
-#: compensation/utils/quality.py:100
+#: compensation/utils/quality.py:88
 msgid "Deductable surface can not be larger than state surface"
 msgstr ""
 "Die abbuchbare Fläche darf die Gesamtfläche der Zielzustände nicht "
 "überschreiten"
 
-#: compensation/utils/quality.py:116 ema/utils/quality.py:30
+#: compensation/utils/quality.py:104 ema/utils/quality.py:30
 #: intervention/utils/quality.py:55
 msgid "Responsible data"
 msgstr "Daten zu den verantwortlichen Stellen"
@@ -1218,7 +1218,7 @@ msgstr "Mehrfachauswahl möglich"
 #: intervention/forms/forms.py:84
 #: intervention/templates/intervention/detail/view.html:48
 #: intervention/templates/intervention/report/report.html:29
-#: intervention/utils/quality.py:46
+#: intervention/utils/quality.py:46 konova/filters/mixins.py:363
 msgid "Registration office"
 msgstr "Zulassungsbehörde"
 
@@ -1508,62 +1508,73 @@ msgstr ""
 "somit nichts eingeben, bearbeiten oder sonstige Aktionen ausführen. "
 "Kontaktieren Sie bitte einen Administrator. +++"
 
-#: konova/filters.py:67
+#: konova/filters/mixins.py:57
 msgid "File number"
 msgstr "Aktenzeichen"
 
-#: konova/filters.py:68
+#: konova/filters/mixins.py:58
 msgid "Search for file number"
 msgstr "Nach Aktenzeichen suchen"
 
-#: konova/filters.py:95
+#: konova/filters/mixins.py:85
 msgid "District"
 msgstr "Kreis"
 
-#: konova/filters.py:96
+#: konova/filters/mixins.py:86
 msgid "Search for district"
 msgstr "Nach Kreis suchen"
 
-#: konova/filters.py:108
+#: konova/filters/mixins.py:98
 msgid "Parcel gmrkng"
 msgstr "Gemarkung"
 
-#: konova/filters.py:109
+#: konova/filters/mixins.py:99
 msgid "Search for parcel gmrkng"
 msgstr "Nach Gemarkung suchen"
 
-#: konova/filters.py:121 konova/templates/konova/includes/parcels.html:18
+#: konova/filters/mixins.py:111
+#: konova/templates/konova/includes/parcels.html:18
 msgid "Parcel"
 msgstr "Flur"
 
-#: konova/filters.py:122
+#: konova/filters/mixins.py:112
 msgid "Search for parcel"
 msgstr "Nach Flur suchen"
 
-#: konova/filters.py:134 konova/templates/konova/includes/parcels.html:19
+#: konova/filters/mixins.py:124
+#: konova/templates/konova/includes/parcels.html:19
 msgid "Parcel counter"
 msgstr "Flurstückzähler"
 
-#: konova/filters.py:135
+#: konova/filters/mixins.py:125
 msgid "Search for parcel counter"
 msgstr "Nach Flurstückzähler suchen"
 
-#: konova/filters.py:148 konova/templates/konova/includes/parcels.html:20
+#: konova/filters/mixins.py:138
+#: konova/templates/konova/includes/parcels.html:20
 msgid "Parcel number"
 msgstr "Flurstücknenner"
 
-#: konova/filters.py:149
+#: konova/filters/mixins.py:139
 msgid "Search for parcel number"
 msgstr "Nach Flurstücknenner suchen"
 
-#: konova/filters.py:279
+#: konova/filters/mixins.py:269
 msgid "Show unshared"
 msgstr "Nicht freigegebene anzeigen"
 
-#: konova/filters.py:323
+#: konova/filters/mixins.py:314
 msgid "Show recorded"
 msgstr "Verzeichnete anzeigen"
 
+#: konova/filters/mixins.py:364
+msgid "Search for registration office"
+msgstr "Nach Zulassungsbehörde suchen"
+
+#: konova/filters/mixins.py:396
+msgid "Search for conservation office"
+msgstr "Nch Eintragungsstelle suchen"
+
 #: konova/forms.py:37 templates/form/collapsable/form.html:62
 msgid "Save"
 msgstr "Speichern"
@@ -1644,28 +1655,24 @@ msgstr ""
 "Ich, {} {}, bestätige, dass diese Daten wieder entzeichnet werden müssen."
 
 #: konova/management/commands/setup_data.py:26
-msgid "On new related data"
-msgstr "Wenn neue Daten für mich angelegt werden"
+msgid "On shared access gained"
+msgstr "Wenn mir eine Freigabe zu Daten erteilt wird"
 
 #: konova/management/commands/setup_data.py:27
-msgid "On disabled share link"
-msgstr "Wenn ein Freigabelink deaktiviert wird"
-
-#: konova/management/commands/setup_data.py:28
 msgid "On shared access removed"
 msgstr "Wenn mir eine Freigabe zu Daten entzogen wird"
 
-#: konova/management/commands/setup_data.py:29
+#: konova/management/commands/setup_data.py:28
 msgid "On shared data recorded"
 msgstr "Wenn meine freigegebenen Daten verzeichnet wurden"
 
-#: konova/management/commands/setup_data.py:30
+#: konova/management/commands/setup_data.py:29
 msgid "On shared data deleted"
 msgstr "Wenn meine freigegebenen Daten gelöscht wurden"
 
-#: konova/management/commands/setup_data.py:31
-msgid "On registered data edited"
-msgstr "Wenn meine freigegebenen Daten bearbeitet wurden"
+#: konova/management/commands/setup_data.py:30
+msgid "On shared data checked"
+msgstr "Wenn meine freigegebenen Daten geprüft wurden"
 
 #: konova/models/deadline.py:18
 msgid "Finished"
@@ -1746,6 +1753,30 @@ msgstr "In Zwischenablage kopiert"
 msgid "Document '{}' deleted"
 msgstr "Dokument '{}' gelöscht"
 
+#: konova/utils/mailer.py:70
+msgid "{} - Shared access removed"
+msgstr "{} - Zugriff entzogen"
+
+#: konova/utils/mailer.py:92
+msgid "{} - Shared access given"
+msgstr "{} - Zugriff freigegeben"
+
+#: konova/utils/mailer.py:114
+msgid "{} - Shared data recorded"
+msgstr "{} - Freigegebene Daten verzeichnet"
+
+#: konova/utils/mailer.py:136
+msgid "{} - Shared data unrecorded"
+msgstr "{} - Freigegebene Daten entzeichnet"
+
+#: konova/utils/mailer.py:158
+msgid "{} - Shared data deleted"
+msgstr "{} - Freigegebene Daten gelöscht"
+
+#: konova/utils/mailer.py:180
+msgid "{} - Shared data checked"
+msgstr "{} - Freigegebene Daten geprüft"
+
 #: konova/utils/message_templates.py:11
 msgid "There was an error on this form."
 msgstr "Es gab einen Fehler im Formular."
@@ -1860,6 +1891,157 @@ msgstr "Alle"
 msgid "News"
 msgstr "Neuigkeiten"
 
+#: templates/email/checking/shared_data_checked.html:4
+msgid "Shared data checked"
+msgstr "Freigegebene Daten geprüft"
+
+#: templates/email/checking/shared_data_checked.html:8
+#: templates/email/deleting/shared_data_deleted.html:8
+#: templates/email/recording/shared_data_recorded.html:8
+#: templates/email/recording/shared_data_unrecorded.html:8
+#: templates/email/sharing/shared_access_given.html:8
+#: templates/email/sharing/shared_access_removed.html:8
+msgid "Hello "
+msgstr "Hallo "
+
+#: templates/email/checking/shared_data_checked.html:10
+msgid "the following dataset has just been checked"
+msgstr "der folgende Datensatz wurde soeben geprüft "
+
+#: templates/email/checking/shared_data_checked.html:14
+msgid ""
+"This means, the responsible registration office just confirmed the "
+"correctness of this dataset."
+msgstr ""
+"Das bedeutet, dass die zuständige Zulassungsbehörde die Korrektheit des Datensatzes "
+"soeben bestätigt hat."
+
+#: templates/email/checking/shared_data_checked.html:17
+#: templates/email/deleting/shared_data_deleted.html:17
+#: templates/email/recording/shared_data_recorded.html:17
+#: templates/email/recording/shared_data_unrecorded.html:17
+#: templates/email/sharing/shared_access_given.html:18
+#: templates/email/sharing/shared_access_removed.html:18
+msgid "Best regards"
+msgstr "Beste Grüße"
+
+#: templates/email/deleting/shared_data_deleted.html:4
+msgid "Shared data deleted"
+msgstr "Freigegebene Daten gelöscht"
+
+#: templates/email/deleting/shared_data_deleted.html:10
+msgid "the following dataset has just been deleted"
+msgstr "der folgende Datensatz wurde soeben gelöscht "
+
+#: templates/email/deleting/shared_data_deleted.html:14
+msgid ""
+"If this should not have been happened, please contact us. See the signature "
+"for details."
+msgstr ""
+"Falls das nicht hätte passieren dürfen, kontaktieren Sie uns bitte. In der E-"
+"mail Signatur finden Sie weitere Kontaktinformationen."
+
+#: templates/email/recording/shared_data_recorded.html:4
+msgid "Shared data recorded"
+msgstr "Freigegebene Daten verzeichnet"
+
+#: templates/email/recording/shared_data_recorded.html:10
+msgid "the following dataset has just been recorded"
+msgstr "der folgende Datensatz wurde soeben verzeichnet "
+
+#: templates/email/recording/shared_data_recorded.html:14
+msgid "This means the data is now publicly available, e.g. in LANIS"
+msgstr ""
+"Das bedeutet, dass die Daten nun öffentlich verfügbar sind, z.B. im LANIS."
+
+#: templates/email/recording/shared_data_recorded.html:24
+msgid ""
+"Please note: Recorded intervention means the compensations are recorded as "
+"well."
+msgstr ""
+"Bitte beachten Sie: Verzeichnete Eingriffe bedeuten, dass auch die "
+"zugehörigen Kompensationen automatisch verzeichnet sind."
+
+#: templates/email/recording/shared_data_unrecorded.html:4
+msgid "Shared data unrecorded"
+msgstr "Freigegebene Daten entzeichnet"
+
+#: templates/email/recording/shared_data_unrecorded.html:10
+msgid "the following dataset has just been unrecorded"
+msgstr "der folgende Datensatz wurde soeben entzeichnet "
+
+#: templates/email/recording/shared_data_unrecorded.html:14
+msgid "This means the data is no longer publicly available."
+msgstr "Das bedeutet, dass die Daten nicht länger öffentlich verfügbar sind."
+
+#: templates/email/recording/shared_data_unrecorded.html:24
+msgid ""
+"Please note: Unrecorded intervention means the compensations are unrecorded "
+"as well."
+msgstr ""
+"Bitte beachten Sie: Entzeichnete Eingriffe bedeuten, dass auch die "
+"zugehörigen Kompensationen automatisch entzeichnet worden sind."
+
+#: templates/email/sharing/shared_access_given.html:4
+msgid "Access shared"
+msgstr "Zugriff freigegeben"
+
+#: templates/email/sharing/shared_access_given.html:10
+msgid "the following dataset has just been shared with you"
+msgstr "der folgende Datensatz wurde soeben für Sie freigegeben "
+
+#: templates/email/sharing/shared_access_given.html:14
+msgid "This means you can now edit this dataset."
+msgstr "Das bedeutet, dass Sie diesen Datensatz nun auch bearbeiten können."
+
+#: templates/email/sharing/shared_access_given.html:15
+msgid ""
+"The shared dataset appears now by default on your overview for this dataset "
+"type."
+msgstr ""
+"Der freigegebene Datensatz ist nun standardmäßig in Ihrer Übersicht für den "
+"Datensatztyp im KSP gelistet."
+
+#: templates/email/sharing/shared_access_given.html:25
+msgid ""
+"Please note: Shared access on an intervention means you automatically have "
+"editing access to related compensations."
+msgstr ""
+"Bitte beachten Sie: Freigegebener Zugriff auf einen Eingriff bedeutet, dass "
+"Sie automatisch auch Zugriff auf die zugehörigen Kompensationen erhalten "
+"haben."
+
+#: templates/email/sharing/shared_access_removed.html:4
+msgid "Shared access removed"
+msgstr "Freigegebener Zugriff entzogen"
+
+#: templates/email/sharing/shared_access_removed.html:10
+msgid ""
+"your shared access, including editing, has been revoked for the dataset "
+msgstr ""
+"Ihnen wurde soeben der bearbeitende Zugriff auf den folgenden Datensatz "
+"entzogen: "
+
+#: templates/email/sharing/shared_access_removed.html:14
+msgid "However, you are still able to view the dataset content."
+msgstr "Sie können den Datensatz aber immer noch im KSP einsehen."
+
+#: templates/email/sharing/shared_access_removed.html:15
+msgid ""
+"Please use the provided search filter on the dataset`s overview pages to "
+"find them."
+msgstr ""
+"Nutzen Sie hierzu einfach die entsprechenden Suchfilter auf den "
+"Übersichtsseiten"
+
+#: templates/email/signature.html:6
+msgid "Please do not reply on this mail."
+msgstr "Bitte antworten Sie nicht auf diese Mail."
+
+#: templates/email/signature.html:8
+msgid "If needed, please contact "
+msgstr "Bei Rückfragen, wenden Sie sich bitte an "
+
 #: templates/footer.html:6
 msgid "Help"
 msgstr "Hilfe"
@@ -1906,35 +2088,35 @@ msgstr "Abbrechen"
 msgid "Fields with * are required."
 msgstr "* sind Pflichtfelder."
 
-#: templates/generic_index.html:28
+#: templates/generic_index.html:39
 msgid "New entry"
 msgstr "Neuer Eintrag"
 
-#: templates/generic_index.html:30
+#: templates/generic_index.html:41
 msgid "New"
 msgstr "Neu"
 
-#: templates/generic_index.html:45
+#: templates/generic_index.html:56
 msgid "Search for keywords"
 msgstr "Nach Schlagwörtern suchen"
 
-#: templates/generic_index.html:45
+#: templates/generic_index.html:56
 msgid "Search"
 msgstr "Suchen"
 
-#: templates/generic_index.html:46
+#: templates/generic_index.html:57
 msgid "Start search"
 msgstr "Starte Suche"
 
-#: templates/generic_index.html:58
+#: templates/generic_index.html:69
 msgid "Results per page"
 msgstr "Treffer pro Seite"
 
-#: templates/generic_index.html:82 templates/generic_index.html:99
+#: templates/generic_index.html:93 templates/generic_index.html:118
 msgid "Filter"
 msgstr ""
 
-#: templates/generic_index.html:101
+#: templates/generic_index.html:120
 msgid "Apply filter"
 msgstr "Filter anwenden"
 
@@ -2015,31 +2197,31 @@ msgstr "Wann wollen Sie per E-Mail benachrichtigt werden?"
 msgid "Edit notifications"
 msgstr "Benachrichtigungen bearbeiten"
 
-#: user/forms.py:76 user/templates/user/index.html:9
+#: user/forms.py:72 user/templates/user/index.html:9
 msgid "Username"
 msgstr "Nutzername"
 
-#: user/forms.py:87
+#: user/forms.py:83
 msgid "Person name"
 msgstr "Name"
 
-#: user/forms.py:98 user/templates/user/index.html:17
+#: user/forms.py:94 user/templates/user/index.html:17
 msgid "E-Mail"
 msgstr ""
 
-#: user/forms.py:112
+#: user/forms.py:108
 msgid "User contact data"
 msgstr "Kontaktdaten"
 
-#: user/models/user_action.py:21
+#: user/models/user_action.py:20
 msgid "Unrecorded"
 msgstr "Entzeichnet"
 
-#: user/models/user_action.py:23
+#: user/models/user_action.py:22
 msgid "Edited"
 msgstr "Bearbeitet"
 
-#: user/models/user_action.py:24
+#: user/models/user_action.py:23
 msgid "Deleted"
 msgstr "Gelöscht"
 
@@ -2084,7 +2266,7 @@ msgstr "Benachrichtigungseinstellungen ändern"
 msgid "Notification settings"
 msgstr "Benachrichtigungen"
 
-#: user/views.py:56
+#: user/views.py:52
 msgid "Notifications edited"
 msgstr "Benachrichtigungen bearbeitet"
 
@@ -3591,6 +3773,18 @@ msgstr ""
 msgid "Unable to connect to qpid with SASL mechanism %s"
 msgstr ""
 
+#~ msgid "On registered data edited"
+#~ msgstr "Wenn meine freigegebenen Daten bearbeitet wurden"
+
+#~ msgid "Not recorded"
+#~ msgstr "Noch nicht verzeichnet"
+
+#~ msgid "On new related data"
+#~ msgstr "Wenn neue Daten für mich angelegt werden"
+
+#~ msgid "On disabled share link"
+#~ msgstr "Wenn ein Freigabelink deaktiviert wird"
+
 #~ msgid "Deduct"
 #~ msgstr "Abbuchen"
 
diff --git a/templates/email/checking/shared_data_checked.html b/templates/email/checking/shared_data_checked.html
new file mode 100644
index 0000000..ccc0bbf
--- /dev/null
+++ b/templates/email/checking/shared_data_checked.html
@@ -0,0 +1,26 @@
+{% load i18n %}
+
+<div>
+    <h2>{% trans 'Shared data checked' %}</h2>
+    <h4>{{obj_identifier}}</h4>
+    <hr>
+    <article>
+        {% trans 'Hello ' %} {{user.username}},
+        <br>
+        {% trans 'the following dataset has just been checked' %}
+        <br>
+        <strong>'{{obj_identifier}}'</strong>
+        <br>
+        {% trans 'This means, the responsible registration office just confirmed the correctness of this dataset.' %}
+        <br>
+        <br>
+        {% trans 'Best regards' %}
+        <br>
+        KSP
+        <br>
+        <br>
+        <br>
+        {% include 'email/signature.html' %}
+    </article>
+</div>
+
diff --git a/templates/email/deleting/shared_data_deleted.html b/templates/email/deleting/shared_data_deleted.html
new file mode 100644
index 0000000..36c80b0
--- /dev/null
+++ b/templates/email/deleting/shared_data_deleted.html
@@ -0,0 +1,26 @@
+{% load i18n %}
+
+<div>
+    <h2>{% trans 'Shared data deleted' %}</h2>
+    <h4>{{obj_identifier}}</h4>
+    <hr>
+    <article>
+        {% trans 'Hello ' %} {{user.username}},
+        <br>
+        {% trans 'the following dataset has just been deleted' %}
+        <br>
+        <strong>'{{obj_identifier}}'</strong>
+        <br>
+        {% trans 'If this should not have been happened, please contact us. See the signature for details.' %}
+        <br>
+        <br>
+        {% trans 'Best regards' %}
+        <br>
+        KSP
+        <br>
+        <br>
+        <br>
+        {% include 'email/signature.html' %}
+    </article>
+</div>
+
diff --git a/templates/email/recording/shared_data_recorded.html b/templates/email/recording/shared_data_recorded.html
new file mode 100644
index 0000000..82d236d
--- /dev/null
+++ b/templates/email/recording/shared_data_recorded.html
@@ -0,0 +1,31 @@
+{% load i18n %}
+
+<div>
+    <h2>{% trans 'Shared data recorded' %}</h2>
+    <h4>{{obj_identifier}}</h4>
+    <hr>
+    <article>
+        {% trans 'Hello ' %} {{user.username}},
+        <br>
+        {% trans 'the following dataset has just been recorded' %}
+        <br>
+        <strong>'{{obj_identifier}}'</strong>
+        <br>
+        {% trans 'This means the data is now publicly available, e.g. in LANIS' %}
+        <br>
+        <br>
+        {% trans 'Best regards' %}
+        <br>
+        KSP
+        <br>
+        <br>
+        <br>
+        <small>
+            {% trans 'Please note: Recorded intervention means the compensations are recorded as well.' %}
+        </small>
+        <br>
+        <br>
+        {% include 'email/signature.html' %}
+    </article>
+</div>
+
diff --git a/templates/email/recording/shared_data_unrecorded.html b/templates/email/recording/shared_data_unrecorded.html
new file mode 100644
index 0000000..a40e7ce
--- /dev/null
+++ b/templates/email/recording/shared_data_unrecorded.html
@@ -0,0 +1,31 @@
+{% load i18n %}
+
+<div>
+    <h2>{% trans 'Shared data unrecorded' %}</h2>
+    <h4>{{obj_identifier}}</h4>
+    <hr>
+    <article>
+        {% trans 'Hello ' %} {{user.username}},
+        <br>
+        {% trans 'the following dataset has just been unrecorded' %}
+        <br>
+        <strong>'{{obj_identifier}}'</strong>
+        <br>
+        {% trans 'This means the data is no longer publicly available.' %}
+        <br>
+        <br>
+        {% trans 'Best regards' %}
+        <br>
+        KSP
+        <br>
+        <br>
+        <br>
+        <small>
+            {% trans 'Please note: Unrecorded intervention means the compensations are unrecorded as well.' %}
+        </small>
+        <br>
+        <br>
+        {% include 'email/signature.html' %}
+    </article>
+</div>
+
diff --git a/templates/email/sharing/shared_access_given.html b/templates/email/sharing/shared_access_given.html
new file mode 100644
index 0000000..bf93e86
--- /dev/null
+++ b/templates/email/sharing/shared_access_given.html
@@ -0,0 +1,32 @@
+{% load i18n %}
+
+<div>
+    <h2>{% trans 'Access shared' %}</h2>
+    <h4>{{obj_identifier}}</h4>
+    <hr>
+    <article>
+        {% trans 'Hello ' %} {{user.username}},
+        <br>
+        {% trans 'the following dataset has just been shared with you' %}
+        <br>
+        <strong>'{{obj_identifier}}'</strong>
+        <br>
+        {% trans 'This means you can now edit this dataset.' %}
+        {% trans 'The shared dataset appears now by default on your overview for this dataset type.' %}
+        <br>
+        <br>
+        {% trans 'Best regards' %}
+        <br>
+        KSP
+        <br>
+        <br>
+        <br>
+        <small>
+            {% trans 'Please note: Shared access on an intervention means you automatically have editing access to related compensations.' %}
+        </small>
+        <br>
+        <br>
+        {% include 'email/signature.html' %}
+    </article>
+</div>
+
diff --git a/templates/email/sharing/shared_access_removed.html b/templates/email/sharing/shared_access_removed.html
new file mode 100644
index 0000000..be6a4d6
--- /dev/null
+++ b/templates/email/sharing/shared_access_removed.html
@@ -0,0 +1,27 @@
+{% load i18n %}
+
+<div>
+    <h2>{% trans 'Shared access removed' %}</h2>
+    <h4>{{obj_identifier}}</h4>
+    <hr>
+    <article>
+        {% trans 'Hello ' %} {{user.username}},
+        <br>
+        {% trans 'your shared access, including editing, has been revoked for the dataset ' %}
+        <br>
+        <strong>'{{obj_identifier}}'</strong>
+        <br>
+        {% trans 'However, you are still able to view the dataset content.' %}
+        {% trans 'Please use the provided search filter on the dataset`s overview pages to find them.' %}
+        <br>
+        <br>
+        {% trans 'Best regards' %}
+        <br>
+        KSP
+        <br>
+        <br>
+        <br>
+        {% include 'email/signature.html' %}
+    </article>
+</div>
+
diff --git a/templates/email/signature.html b/templates/email/signature.html
new file mode 100644
index 0000000..48f0909
--- /dev/null
+++ b/templates/email/signature.html
@@ -0,0 +1,10 @@
+{% load i18n %}
+
+<div>
+    <hr>
+    <small>
+        {% trans 'Please do not reply on this mail.' %}
+        <br>
+        {% trans 'If needed, please contact ' %} <a href="mailto:{{EMAIL_REPLY_TO}}">{{EMAIL_REPLY_TO}}</a>.
+    </small>
+</div>
\ No newline at end of file
diff --git a/user/admin.py b/user/admin.py
index 9a633e7..92266b9 100644
--- a/user/admin.py
+++ b/user/admin.py
@@ -1,6 +1,6 @@
 from django.contrib import admin
 
-from user.models import UserNotification, KonovaUserExtension, UserActionLogEntry
+from user.models import UserNotification, UserActionLogEntry, User
 
 
 class UserNotificationAdmin(admin.ModelAdmin):
@@ -11,9 +11,13 @@ class UserNotificationAdmin(admin.ModelAdmin):
     ]
 
 
-class KonovaUserExtensionAdmin(admin.ModelAdmin):
+class UserAdmin(admin.ModelAdmin):
     list_display = [
-        "user",
+        "id",
+        "username",
+        "first_name",
+        "last_name",
+        "email",
     ]
 
 
@@ -27,5 +31,5 @@ class UserActionLogEntryAdmin(admin.ModelAdmin):
 
 
 admin.site.register(UserNotification, UserNotificationAdmin)
-admin.site.register(KonovaUserExtension, KonovaUserExtensionAdmin)
-admin.site.register(UserActionLogEntry, UserActionLogEntryAdmin)
\ No newline at end of file
+admin.site.register(UserActionLogEntry, UserActionLogEntryAdmin)
+admin.site.register(User, UserAdmin)
\ No newline at end of file
diff --git a/user/enums.py b/user/enums.py
index 1575a77..8d0c34d 100644
--- a/user/enums.py
+++ b/user/enums.py
@@ -9,9 +9,8 @@ from konova.enums import BaseEnum
 
 
 class UserNotificationEnum(BaseEnum):
-    NOTIFY_ON_NEW_RELATED_DATA = "NOTIFY_ON_NEW_RELATED_DATA"  # notifies in case new data has been added which is related to the user's organisation
-    NOTIFY_ON_SHARE_LINK_DISABLED = "NOTIFY_ON_SHARE_LINK_DISABLED"  # notifies in case share link for data has been disabled
     NOTIFY_ON_SHARED_ACCESS_REMOVED = "NOTIFY_ON_SHARED_ACCESS_REMOVED"  # notifies in case shared access to data has been removed
     NOTIFY_ON_SHARED_DATA_RECORDED = "NOTIFY_ON_SHARED_DATA_RECORDED"  # notifies in case data has been "verzeichnet"
     NOTIFY_ON_SHARED_DATA_DELETED = "NOTIFY_ON_SHARED_DATA_DELETED"  # notifies in case data has been deleted
-    NOTIFY_ON_REGISTERED_DATA_EDITED = "NOTIFY_ON_REGISTERED_DATA_EDITED"  # notifies in case registered ("verzeichnet") data has been edited
\ No newline at end of file
+    NOTIFY_ON_SHARED_DATA_CHECKED = "NOTIFY_ON_SHARED_DATA_CHECKED"  # notifies in case shared data has been checked
+    NOTIFY_ON_SHARED_ACCESS_GAINED = "NOTIFY_ON_SHARED_ACCESS_GAINED"  # notifies in case new access has been gained
\ No newline at end of file
diff --git a/user/forms.py b/user/forms.py
index 6d6accb..66f9fab 100644
--- a/user/forms.py
+++ b/user/forms.py
@@ -8,10 +8,10 @@ Created on: 08.07.21
 from django import forms
 from django.urls import reverse
 from django.utils.translation import gettext_lazy as _
-from django.contrib.auth.models import User
+from user.models import User
 
 from konova.forms import BaseForm, BaseModalForm
-from user.models import UserNotification, KonovaUserExtension
+from user.models import UserNotification
 
 
 class UserNotificationForm(BaseForm):
@@ -50,11 +50,7 @@ class UserNotificationForm(BaseForm):
             )
         self.fields["notifications"].choices = choices
 
-        # Set currently selected notifications as initial
-        self.konova_extension = KonovaUserExtension.objects.get_or_create(
-            user=user
-        )[0]
-        users_current_notifications = self.konova_extension.notifications.all()
+        users_current_notifications = self.user.notifications.all()
         users_current_notifications = [str(n.id) for n in users_current_notifications]
         self.fields["notifications"].initial = users_current_notifications
 
@@ -68,7 +64,7 @@ class UserNotificationForm(BaseForm):
         notifications = UserNotification.objects.filter(
             id__in=selected_notification_ids,
         )
-        self.konova_extension.notifications.set(notifications)
+        self.user.notifications.set(notifications)
 
 
 class UserContactForm(BaseModalForm):
diff --git a/user/models/__init__.py b/user/models/__init__.py
index 85a98b6..7788d8e 100644
--- a/user/models/__init__.py
+++ b/user/models/__init__.py
@@ -6,5 +6,5 @@ Created on: 15.11.21
 
 """
 from .user_action import *
-from .konova_user import *
+from .user import *
 from .notification import *
diff --git a/user/models/konova_user.py b/user/models/konova_user.py
deleted file mode 100644
index b100e02..0000000
--- a/user/models/konova_user.py
+++ /dev/null
@@ -1,19 +0,0 @@
-"""
-Author: Michel Peltriaux
-Organization: Struktur- und Genehmigungsdirektion Nord, Rhineland-Palatinate, Germany
-Contact: michel.peltriaux@sgdnord.rlp.de
-Created on: 15.11.21
-
-"""
-from django.contrib.auth.models import User
-from django.db import models
-
-
-class KonovaUserExtension(models.Model):
-    """ Extension model for additional ksp features
-
-    Extends the default user model for some extras
-
-    """
-    user = models.OneToOneField(User, on_delete=models.CASCADE)
-    notifications = models.ManyToManyField("user.UserNotification", related_name="+")
diff --git a/user/models/user.py b/user/models/user.py
new file mode 100644
index 0000000..837f0c6
--- /dev/null
+++ b/user/models/user.py
@@ -0,0 +1,106 @@
+"""
+Author: Michel Peltriaux
+Organization: Struktur- und Genehmigungsdirektion Nord, Rhineland-Palatinate, Germany
+Contact: michel.peltriaux@sgdnord.rlp.de
+Created on: 15.11.21
+
+"""
+from django.contrib.auth.models import AbstractUser
+
+from django.db import models
+
+from konova.utils.mailer import Mailer
+from user.enums import UserNotificationEnum
+
+
+class User(AbstractUser):
+    notifications = models.ManyToManyField("user.UserNotification", related_name="+", blank=True)
+
+    def is_notification_setting_set(self, notification_enum: UserNotificationEnum):
+        return self.notifications.filter(
+            id=notification_enum.value
+        ).exists()
+
+    def send_mail_shared_access_removed(self, obj_identifier):
+        """ Sends a mail to the user in case of removed shared access
+
+        Args:
+            obj_identifier ():
+
+        Returns:
+
+        """
+        notification_set = self.is_notification_setting_set(UserNotificationEnum.NOTIFY_ON_SHARED_ACCESS_REMOVED)
+        if notification_set:
+            mailer = Mailer()
+            mailer.send_mail_shared_access_removed(obj_identifier, self)
+
+    def send_mail_shared_access_given(self, obj_identifier):
+        """ Sends a mail to the user in case of given shared access
+
+        Args:
+            obj_identifier ():
+
+        Returns:
+
+        """
+        notification_set = self.is_notification_setting_set(UserNotificationEnum.NOTIFY_ON_SHARED_ACCESS_GAINED)
+        if notification_set:
+            mailer = Mailer()
+            mailer.send_mail_shared_access_given(obj_identifier, self)
+
+    def send_mail_shared_data_recorded(self, obj_identifier):
+        """ Sends a mail to the user in case of shared data has been recorded
+
+        Args:
+            obj_identifier ():
+
+        Returns:
+
+        """
+        notification_set = self.is_notification_setting_set(UserNotificationEnum.NOTIFY_ON_SHARED_DATA_RECORDED)
+        if notification_set:
+            mailer = Mailer()
+            mailer.send_mail_shared_data_recorded(obj_identifier, self)
+
+    def send_mail_shared_data_unrecorded(self, obj_identifier):
+        """ Sends a mail to the user in case of shared data has been unrecorded
+
+        Args:
+            obj_identifier ():
+
+        Returns:
+
+        """
+        notification_set = self.is_notification_setting_set(UserNotificationEnum.NOTIFY_ON_SHARED_DATA_RECORDED)
+        if notification_set:
+            mailer = Mailer()
+            mailer.send_mail_shared_data_unrecorded(obj_identifier, self)
+
+    def send_mail_shared_data_deleted(self, obj_identifier):
+        """ Sends a mail to the user in case of shared data has been deleted
+
+        Args:
+            obj_identifier ():
+
+        Returns:
+
+        """
+        notification_set = self.is_notification_setting_set(UserNotificationEnum.NOTIFY_ON_SHARED_DATA_DELETED)
+        if notification_set:
+            mailer = Mailer()
+            mailer.send_mail_shared_data_deleted(obj_identifier, self)
+
+    def send_mail_shared_data_checked(self, obj_identifier):
+        """ Sends a mail to the user in case of shared data has been deleted
+
+        Args:
+            obj_identifier ():
+
+        Returns:
+
+        """
+        notification_set = self.is_notification_setting_set(UserNotificationEnum.NOTIFY_ON_SHARED_DATA_CHECKED)
+        if notification_set:
+            mailer = Mailer()
+            mailer.send_mail_shared_data_checked(obj_identifier, self)
diff --git a/user/models/user_action.py b/user/models/user_action.py
index c1894f7..d902c5d 100644
--- a/user/models/user_action.py
+++ b/user/models/user_action.py
@@ -7,7 +7,6 @@ Created on: 15.11.21
 """
 import uuid
 
-from django.contrib.auth.models import User
 from django.db import models
 from django.utils.translation import gettext_lazy as _
 
@@ -34,7 +33,7 @@ class UserActionLogEntry(models.Model):
         primary_key=True,
         default=uuid.uuid4,
     )
-    user = models.ForeignKey(User, related_name='+', on_delete=models.CASCADE, help_text="Performing user")
+    user = models.ForeignKey("user.User", related_name='+', on_delete=models.CASCADE, help_text="Performing user")
     timestamp = models.DateTimeField(auto_now_add=True, help_text="Timestamp of performed action")
     action = models.CharField(
         max_length=255,
@@ -50,9 +49,6 @@ class UserActionLogEntry(models.Model):
             "-timestamp",
         )
 
-    def __str__(self):
-        return "{} | {} | {}".format(self.user.username, self.timestamp, self.action)
-
     @property
     def action_humanize(self):
         """ Returns humanized version of enum
@@ -69,7 +65,7 @@ class UserActionLogEntry(models.Model):
         return None
 
     @classmethod
-    def get_created_action(cls, user: User, comment: str = None):
+    def get_created_action(cls, user, comment: str = None):
         action = UserActionLogEntry.objects.create(
             user=user,
             action=UserAction.CREATED,
@@ -78,7 +74,7 @@ class UserActionLogEntry(models.Model):
         return action
 
     @classmethod
-    def get_edited_action(cls, user: User, comment: str = None):
+    def get_edited_action(cls, user, comment: str = None):
         action = UserActionLogEntry.objects.create(
             user=user,
             action=UserAction.EDITED,
@@ -87,7 +83,7 @@ class UserActionLogEntry(models.Model):
         return action
 
     @classmethod
-    def get_deleted_action(cls, user: User, comment: str = None):
+    def get_deleted_action(cls, user, comment: str = None):
         action = UserActionLogEntry.objects.create(
             user=user,
             action=UserAction.DELETED,
@@ -96,7 +92,7 @@ class UserActionLogEntry(models.Model):
         return action
 
     @classmethod
-    def get_checked_action(cls, user: User, comment: str = None):
+    def get_checked_action(cls, user, comment: str = None):
         action = UserActionLogEntry.objects.create(
             user=user,
             action=UserAction.CHECKED,
@@ -105,7 +101,7 @@ class UserActionLogEntry(models.Model):
         return action
 
     @classmethod
-    def get_recorded_action(cls, user: User, comment: str = None):
+    def get_recorded_action(cls, user, comment: str = None):
         action = UserActionLogEntry.objects.create(
             user=user,
             action=UserAction.RECORDED,
@@ -114,7 +110,7 @@ class UserActionLogEntry(models.Model):
         return action
 
     @classmethod
-    def get_unrecorded_action(cls, user: User, comment: str = None):
+    def get_unrecorded_action(cls, user, comment: str = None):
         action = UserActionLogEntry.objects.create(
             user=user,
             action=UserAction.UNRECORDED,
diff --git a/user/views.py b/user/views.py
index f63b14b..13fecf5 100644
--- a/user/views.py
+++ b/user/views.py
@@ -1,6 +1,6 @@
 from django.contrib import messages
 from django.contrib.auth.decorators import login_required
-from django.contrib.auth.models import User
+from user.models import User
 from django.http import HttpRequest
 from django.shortcuts import render, redirect, get_object_or_404
 from django.utils.translation import gettext_lazy as _
@@ -8,7 +8,6 @@ from django.utils.translation import gettext_lazy as _
 from konova.contexts import BaseContext
 from konova.decorators import any_group_check
 from user.forms import UserNotificationForm, UserContactForm
-from user.models import KonovaUserExtension
 
 
 @login_required
@@ -43,9 +42,6 @@ def notifications_view(request: HttpRequest):
     """
     template = "user/notifications.html"
     user = request.user
-    konova_ext = KonovaUserExtension.objects.get_or_create(
-        user=user
-    )[0]
 
     form = UserNotificationForm(user=user, data=request.POST or None)
     if request.method == "POST":
@@ -65,7 +61,6 @@ def notifications_view(request: HttpRequest):
     context = {
         "user": user,
         "form": form,
-        "konova_ext": konova_ext,
     }
     context = BaseContext(request, context).context
     return render(request, template, context)