diff --git a/README.rst b/README.rst
index 2393b6dae..a9bf44400 100644
--- a/README.rst
+++ b/README.rst
@@ -55,6 +55,17 @@ Finally, you can start the instance using ``docker-compose``::
     $ # ...
     $ docker-compose down
 
+More settings
+-------------
+
+When generating the ``docker-compose.yml``, more settings can be adjusted in the
+``docker/.env`` file. All changes for the backend are passed into djangos ``settings.py``.
+You can find more information about most settings `here
+<https://github.com/OpenSlides/OpenSlides/blob/master/server/SETTINGS.rst>`_. To generate
+the ``docker-compose.yml`` use this command::
+
+    $ ( set -a; source .env; m4 docker-stack.yml.m4 ) > docker-stack.yml
+
 
 Docker Swarm Mode
 -----------------
diff --git a/docker/.env b/docker/.env
index c4dbdfd09..9f0070ba1 100644
--- a/docker/.env
+++ b/docker/.env
@@ -63,6 +63,9 @@ EMAIL_HOST=
 EMAIL_HOST_PASSWORD=
 EMAIL_HOST_USER=
 EMAIL_PORT=
+EMAIL_USE_SSL=
+EMAIL_USE_TLS=
+EMAIL_TIMEOUT=
 JITSI_DOMAIN=
 JITSI_ROOM_PASSWORD=
 JITSI_ROOM_NAME=
diff --git a/docker/docker-compose.yml.m4 b/docker/docker-compose.yml.m4
index d3eece276..f707eb1ec 100644
--- a/docker/docker-compose.yml.m4
+++ b/docker/docker-compose.yml.m4
@@ -59,6 +59,9 @@ x-osserver-env: &default-osserver-env
     EMAIL_HOST_PASSWORD: "ifenvelse(`EMAIL_HOST_PASSWORD',)"
     EMAIL_HOST_USER: "ifenvelse(`EMAIL_HOST_USER',)"
     EMAIL_PORT: ifenvelse(`EMAIL_PORT', 25)
+    EMAIL_USE_SSL: "ifenvelse(`EMAIL_USE_SSL',)"
+    EMAIL_USE_TLS: "ifenvelse(`EMAIL_USE_TLS',)"
+    EMAIL_TIMEOUT: "ifenvelse(`EMAIL_TIMEOUT',)"
     ENABLE_ELECTRONIC_VOTING: "ifenvelse(`ENABLE_ELECTRONIC_VOTING', False)"
     ENABLE_SAML: "ifenvelse(`ENABLE_SAML', False)"
     INSTANCE_DOMAIN: "ifenvelse(`INSTANCE_DOMAIN', http://example.com:8000)"
diff --git a/docker/docker-stack.yml.m4 b/docker/docker-stack.yml.m4
index 7e55656ca..cfcb372a1 100644
--- a/docker/docker-stack.yml.m4
+++ b/docker/docker-stack.yml.m4
@@ -58,6 +58,9 @@ x-osserver-env: &default-osserver-env
     EMAIL_HOST_PASSWORD: "ifenvelse(`EMAIL_HOST_PASSWORD',)"
     EMAIL_HOST_USER: "ifenvelse(`EMAIL_HOST_USER',)"
     EMAIL_PORT: ifenvelse(`EMAIL_PORT', 25)
+    EMAIL_USE_SSL: "ifenvelse(`EMAIL_USE_SSL',)"
+    EMAIL_USE_TLS: "ifenvelse(`EMAIL_USE_TLS',)"
+    EMAIL_TIMEOUT: "ifenvelse(`EMAIL_TIMEOUT',)"
     ENABLE_ELECTRONIC_VOTING: "ifenvelse(`ENABLE_ELECTRONIC_VOTING', False)"
     ENABLE_SAML: "ifenvelse(`ENABLE_SAML', False)"
     INSTANCE_DOMAIN: "ifenvelse(`INSTANCE_DOMAIN', http://example.com:8000)"
diff --git a/server/docker/settings.py b/server/docker/settings.py
index 722795b14..722982eab 100644
--- a/server/docker/settings.py
+++ b/server/docker/settings.py
@@ -59,11 +59,14 @@ DEMO_USERS = get_env("DEMO_USERS", default=None)
 DEMO_USERS = json.loads(DEMO_USERS) if DEMO_USERS else None
 
 # Email settings
-# For SSL/TLS specific settings see https://docs.djangoproject.com/en/1.11/topics/email/#smtp-backend
+# For an explaination and more settings values see https://docs.djangoproject.com/en/2.2/topics/email/#smtp-backend
 EMAIL_HOST = get_env("EMAIL_HOST", "postfix")
 EMAIL_PORT = get_env("EMAIL_PORT", 25, int)
 EMAIL_HOST_USER = get_env("EMAIL_HOST_USER", "")
 EMAIL_HOST_PASSWORD = get_env("EMAIL_HOST_PASSWORD", "")
+EMAIL_USE_SSL = get_env("EMAIL_USE_SSL", False, bool)
+EMAIL_USE_TLS = get_env("EMAIL_USE_TLS", False, bool)
+EMAIL_TIMEOUT = get_env("EMAIL_TIMEOUT", None, int)
 DEFAULT_FROM_EMAIL = get_env("DEFAULT_FROM_EMAIL", "noreply@example.com")
 
 # Increasing Upload size to 100mb (default is 2.5mb)
diff --git a/server/openslides/utils/settings.py.tpl b/server/openslides/utils/settings.py.tpl
index 30eedeebb..071e67ea7 100644
--- a/server/openslides/utils/settings.py.tpl
+++ b/server/openslides/utils/settings.py.tpl
@@ -45,12 +45,15 @@ DEBUG = %(debug)s
 RESET_PASSWORD_VERBOSE_ERRORS = True
 
 # Email settings
-# For SSL/TLS specific settings see https://docs.djangoproject.com/en/1.11/topics/email/#smtp-backend
+# For an explaination and more settings values see https://docs.djangoproject.com/en/2.2/topics/email/#smtp-backend
 
 EMAIL_HOST = 'localhost'
 EMAIL_PORT = 587
 EMAIL_HOST_USER = ''
 EMAIL_HOST_PASSWORD = ''
+EMAIL_USE_SSL = False
+EMAIL_USE_TLS = False
+EMAIL_TIMEOUT = None
 DEFAULT_FROM_EMAIL = 'noreply@example.com'
 
 # Increasing Upload size to 100mb (default is 2.5mb)