diff --git a/.config/smtp.config.php b/.config/smtp.config.php
new file mode 100644
index 0000000..59f1eaa
--- /dev/null
+++ b/.config/smtp.config.php
@@ -0,0 +1,15 @@
+<?php
+if (getenv('SMTP_HOST') && getenv('MAIL_FROM_ADDRESS') && getenv('MAIL_DOMAIN')) {
+  $CONFIG = array (
+    'mail_smtpmode' => 'smtp',
+    'mail_smtphost' => getenv('SMTP_HOST'),
+    'mail_smtpport' => getenv('SMTP_PORT') ?: (getenv('SMTP_SECURE') ? 465 : 25),
+    'mail_smtpsecure' => getenv('SMTP_SECURE') ?: '',
+    'mail_smtpauth' => getenv('SMTP_NAME') && getenv('SMTP_PASSWORD'),
+    'mail_smtpauthtype' => getenv('SMTP_AUTHTYPE') ?: 'LOGIN',
+    'mail_smtpname' => getenv('SMTP_NAME') ?: '',
+    'mail_smtppassword' => getenv('SMTP_PASSWORD') ?: '',
+    'mail_from_address' => getenv('MAIL_FROM_ADDRESS'),
+    'mail_domain' => getenv('MAIL_DOMAIN'),
+  );
+}
diff --git a/14.0/apache/config/smtp.config.php b/14.0/apache/config/smtp.config.php
new file mode 100644
index 0000000..59f1eaa
--- /dev/null
+++ b/14.0/apache/config/smtp.config.php
@@ -0,0 +1,15 @@
+<?php
+if (getenv('SMTP_HOST') && getenv('MAIL_FROM_ADDRESS') && getenv('MAIL_DOMAIN')) {
+  $CONFIG = array (
+    'mail_smtpmode' => 'smtp',
+    'mail_smtphost' => getenv('SMTP_HOST'),
+    'mail_smtpport' => getenv('SMTP_PORT') ?: (getenv('SMTP_SECURE') ? 465 : 25),
+    'mail_smtpsecure' => getenv('SMTP_SECURE') ?: '',
+    'mail_smtpauth' => getenv('SMTP_NAME') && getenv('SMTP_PASSWORD'),
+    'mail_smtpauthtype' => getenv('SMTP_AUTHTYPE') ?: 'LOGIN',
+    'mail_smtpname' => getenv('SMTP_NAME') ?: '',
+    'mail_smtppassword' => getenv('SMTP_PASSWORD') ?: '',
+    'mail_from_address' => getenv('MAIL_FROM_ADDRESS'),
+    'mail_domain' => getenv('MAIL_DOMAIN'),
+  );
+}
diff --git a/14.0/fpm-alpine/config/smtp.config.php b/14.0/fpm-alpine/config/smtp.config.php
new file mode 100644
index 0000000..59f1eaa
--- /dev/null
+++ b/14.0/fpm-alpine/config/smtp.config.php
@@ -0,0 +1,15 @@
+<?php
+if (getenv('SMTP_HOST') && getenv('MAIL_FROM_ADDRESS') && getenv('MAIL_DOMAIN')) {
+  $CONFIG = array (
+    'mail_smtpmode' => 'smtp',
+    'mail_smtphost' => getenv('SMTP_HOST'),
+    'mail_smtpport' => getenv('SMTP_PORT') ?: (getenv('SMTP_SECURE') ? 465 : 25),
+    'mail_smtpsecure' => getenv('SMTP_SECURE') ?: '',
+    'mail_smtpauth' => getenv('SMTP_NAME') && getenv('SMTP_PASSWORD'),
+    'mail_smtpauthtype' => getenv('SMTP_AUTHTYPE') ?: 'LOGIN',
+    'mail_smtpname' => getenv('SMTP_NAME') ?: '',
+    'mail_smtppassword' => getenv('SMTP_PASSWORD') ?: '',
+    'mail_from_address' => getenv('MAIL_FROM_ADDRESS'),
+    'mail_domain' => getenv('MAIL_DOMAIN'),
+  );
+}
diff --git a/14.0/fpm/config/smtp.config.php b/14.0/fpm/config/smtp.config.php
new file mode 100644
index 0000000..59f1eaa
--- /dev/null
+++ b/14.0/fpm/config/smtp.config.php
@@ -0,0 +1,15 @@
+<?php
+if (getenv('SMTP_HOST') && getenv('MAIL_FROM_ADDRESS') && getenv('MAIL_DOMAIN')) {
+  $CONFIG = array (
+    'mail_smtpmode' => 'smtp',
+    'mail_smtphost' => getenv('SMTP_HOST'),
+    'mail_smtpport' => getenv('SMTP_PORT') ?: (getenv('SMTP_SECURE') ? 465 : 25),
+    'mail_smtpsecure' => getenv('SMTP_SECURE') ?: '',
+    'mail_smtpauth' => getenv('SMTP_NAME') && getenv('SMTP_PASSWORD'),
+    'mail_smtpauthtype' => getenv('SMTP_AUTHTYPE') ?: 'LOGIN',
+    'mail_smtpname' => getenv('SMTP_NAME') ?: '',
+    'mail_smtppassword' => getenv('SMTP_PASSWORD') ?: '',
+    'mail_from_address' => getenv('MAIL_FROM_ADDRESS'),
+    'mail_domain' => getenv('MAIL_DOMAIN'),
+  );
+}
diff --git a/15.0/apache/config/smtp.config.php b/15.0/apache/config/smtp.config.php
new file mode 100644
index 0000000..59f1eaa
--- /dev/null
+++ b/15.0/apache/config/smtp.config.php
@@ -0,0 +1,15 @@
+<?php
+if (getenv('SMTP_HOST') && getenv('MAIL_FROM_ADDRESS') && getenv('MAIL_DOMAIN')) {
+  $CONFIG = array (
+    'mail_smtpmode' => 'smtp',
+    'mail_smtphost' => getenv('SMTP_HOST'),
+    'mail_smtpport' => getenv('SMTP_PORT') ?: (getenv('SMTP_SECURE') ? 465 : 25),
+    'mail_smtpsecure' => getenv('SMTP_SECURE') ?: '',
+    'mail_smtpauth' => getenv('SMTP_NAME') && getenv('SMTP_PASSWORD'),
+    'mail_smtpauthtype' => getenv('SMTP_AUTHTYPE') ?: 'LOGIN',
+    'mail_smtpname' => getenv('SMTP_NAME') ?: '',
+    'mail_smtppassword' => getenv('SMTP_PASSWORD') ?: '',
+    'mail_from_address' => getenv('MAIL_FROM_ADDRESS'),
+    'mail_domain' => getenv('MAIL_DOMAIN'),
+  );
+}
diff --git a/15.0/fpm-alpine/config/smtp.config.php b/15.0/fpm-alpine/config/smtp.config.php
new file mode 100644
index 0000000..59f1eaa
--- /dev/null
+++ b/15.0/fpm-alpine/config/smtp.config.php
@@ -0,0 +1,15 @@
+<?php
+if (getenv('SMTP_HOST') && getenv('MAIL_FROM_ADDRESS') && getenv('MAIL_DOMAIN')) {
+  $CONFIG = array (
+    'mail_smtpmode' => 'smtp',
+    'mail_smtphost' => getenv('SMTP_HOST'),
+    'mail_smtpport' => getenv('SMTP_PORT') ?: (getenv('SMTP_SECURE') ? 465 : 25),
+    'mail_smtpsecure' => getenv('SMTP_SECURE') ?: '',
+    'mail_smtpauth' => getenv('SMTP_NAME') && getenv('SMTP_PASSWORD'),
+    'mail_smtpauthtype' => getenv('SMTP_AUTHTYPE') ?: 'LOGIN',
+    'mail_smtpname' => getenv('SMTP_NAME') ?: '',
+    'mail_smtppassword' => getenv('SMTP_PASSWORD') ?: '',
+    'mail_from_address' => getenv('MAIL_FROM_ADDRESS'),
+    'mail_domain' => getenv('MAIL_DOMAIN'),
+  );
+}
diff --git a/15.0/fpm/config/smtp.config.php b/15.0/fpm/config/smtp.config.php
new file mode 100644
index 0000000..59f1eaa
--- /dev/null
+++ b/15.0/fpm/config/smtp.config.php
@@ -0,0 +1,15 @@
+<?php
+if (getenv('SMTP_HOST') && getenv('MAIL_FROM_ADDRESS') && getenv('MAIL_DOMAIN')) {
+  $CONFIG = array (
+    'mail_smtpmode' => 'smtp',
+    'mail_smtphost' => getenv('SMTP_HOST'),
+    'mail_smtpport' => getenv('SMTP_PORT') ?: (getenv('SMTP_SECURE') ? 465 : 25),
+    'mail_smtpsecure' => getenv('SMTP_SECURE') ?: '',
+    'mail_smtpauth' => getenv('SMTP_NAME') && getenv('SMTP_PASSWORD'),
+    'mail_smtpauthtype' => getenv('SMTP_AUTHTYPE') ?: 'LOGIN',
+    'mail_smtpname' => getenv('SMTP_NAME') ?: '',
+    'mail_smtppassword' => getenv('SMTP_PASSWORD') ?: '',
+    'mail_from_address' => getenv('MAIL_FROM_ADDRESS'),
+    'mail_domain' => getenv('MAIL_DOMAIN'),
+  );
+}
diff --git a/16.0/apache/config/smtp.config.php b/16.0/apache/config/smtp.config.php
new file mode 100644
index 0000000..59f1eaa
--- /dev/null
+++ b/16.0/apache/config/smtp.config.php
@@ -0,0 +1,15 @@
+<?php
+if (getenv('SMTP_HOST') && getenv('MAIL_FROM_ADDRESS') && getenv('MAIL_DOMAIN')) {
+  $CONFIG = array (
+    'mail_smtpmode' => 'smtp',
+    'mail_smtphost' => getenv('SMTP_HOST'),
+    'mail_smtpport' => getenv('SMTP_PORT') ?: (getenv('SMTP_SECURE') ? 465 : 25),
+    'mail_smtpsecure' => getenv('SMTP_SECURE') ?: '',
+    'mail_smtpauth' => getenv('SMTP_NAME') && getenv('SMTP_PASSWORD'),
+    'mail_smtpauthtype' => getenv('SMTP_AUTHTYPE') ?: 'LOGIN',
+    'mail_smtpname' => getenv('SMTP_NAME') ?: '',
+    'mail_smtppassword' => getenv('SMTP_PASSWORD') ?: '',
+    'mail_from_address' => getenv('MAIL_FROM_ADDRESS'),
+    'mail_domain' => getenv('MAIL_DOMAIN'),
+  );
+}
diff --git a/16.0/fpm-alpine/config/smtp.config.php b/16.0/fpm-alpine/config/smtp.config.php
new file mode 100644
index 0000000..59f1eaa
--- /dev/null
+++ b/16.0/fpm-alpine/config/smtp.config.php
@@ -0,0 +1,15 @@
+<?php
+if (getenv('SMTP_HOST') && getenv('MAIL_FROM_ADDRESS') && getenv('MAIL_DOMAIN')) {
+  $CONFIG = array (
+    'mail_smtpmode' => 'smtp',
+    'mail_smtphost' => getenv('SMTP_HOST'),
+    'mail_smtpport' => getenv('SMTP_PORT') ?: (getenv('SMTP_SECURE') ? 465 : 25),
+    'mail_smtpsecure' => getenv('SMTP_SECURE') ?: '',
+    'mail_smtpauth' => getenv('SMTP_NAME') && getenv('SMTP_PASSWORD'),
+    'mail_smtpauthtype' => getenv('SMTP_AUTHTYPE') ?: 'LOGIN',
+    'mail_smtpname' => getenv('SMTP_NAME') ?: '',
+    'mail_smtppassword' => getenv('SMTP_PASSWORD') ?: '',
+    'mail_from_address' => getenv('MAIL_FROM_ADDRESS'),
+    'mail_domain' => getenv('MAIL_DOMAIN'),
+  );
+}
diff --git a/16.0/fpm/config/smtp.config.php b/16.0/fpm/config/smtp.config.php
new file mode 100644
index 0000000..59f1eaa
--- /dev/null
+++ b/16.0/fpm/config/smtp.config.php
@@ -0,0 +1,15 @@
+<?php
+if (getenv('SMTP_HOST') && getenv('MAIL_FROM_ADDRESS') && getenv('MAIL_DOMAIN')) {
+  $CONFIG = array (
+    'mail_smtpmode' => 'smtp',
+    'mail_smtphost' => getenv('SMTP_HOST'),
+    'mail_smtpport' => getenv('SMTP_PORT') ?: (getenv('SMTP_SECURE') ? 465 : 25),
+    'mail_smtpsecure' => getenv('SMTP_SECURE') ?: '',
+    'mail_smtpauth' => getenv('SMTP_NAME') && getenv('SMTP_PASSWORD'),
+    'mail_smtpauthtype' => getenv('SMTP_AUTHTYPE') ?: 'LOGIN',
+    'mail_smtpname' => getenv('SMTP_NAME') ?: '',
+    'mail_smtppassword' => getenv('SMTP_PASSWORD') ?: '',
+    'mail_from_address' => getenv('MAIL_FROM_ADDRESS'),
+    'mail_domain' => getenv('MAIL_DOMAIN'),
+  );
+}
diff --git a/README.md b/README.md
index 3f5f3b7..824d5da 100644
--- a/README.md
+++ b/README.md
@@ -130,13 +130,27 @@ The install and update script is only triggered when a default command is used (
 
 - `NEXTCLOUD_UPDATE` (default: _0_)
 
-If you want to use Redis you have to create a seperate [Redis](https://hub.docker.com/_/redis/) container in your setup / in your docker-compose file. To inform Nextcloud about the Redis container add:
+If you want to use Redis you have to create a separate [Redis](https://hub.docker.com/_/redis/) container in your setup / in your docker-compose file. To inform Nextcloud about the Redis container add:
 
 - `REDIS_HOST` (not set by default) Name of Redis container
 - `REDIS_HOST_PORT` (default: _6379_) Optional port for Redis, only use for external Redis servers that run on non-standard ports.
 
 The use of Redis is recommended to prevent file locking problems. See the examples for further instructions.
 
+To use a external SMTP server you have to provide the conection details. To configure Nextcloud to use SMTP add:
+
+- `SMTP_HOST` (not set by default) hostname of the SMTP server
+- `SMTP_SECURE` (empty by default) set to 'ssl' to use SSL on the connection.
+- `SMTP_PORT` (default: _465_ for SSL and _25_ for non-secure connection) Optional port for SMTP connection.
+- `SMTP_AUTHTYPE` (default: _LOGIN_) The method used for authentication.
+- `SMTP_NAME` (empty by default) Username for the authentication.
+- `SMTP_PASSWORD` (empty by default) Password for the authentication.
+- `MAIL_FROM_ADDRESS` (not set by default) Use this address for the 'from' field in the mail envelopes sent by Nextcloud.
+- `MAIL_DOMAIN` (not set by default) Set a different domain for the emails than the domain where Nextcloud is installed.
+
+Check the [Nextcloud documentation](https://docs.nextcloud.com/server/15/admin_manual/configuration_server/email_configuration.html) for other values to configure SMTP.
+
+
 # Running this image with docker-compose
 The easiest way to get a fully featured and functional setup is using a `docker-compose` file. There are too many different possibilities to setup your system, so here are only some examples what you have to look for.