diff --git a/doc/configuration.rst b/doc/configuration.rst
index ee4368555..808f3193b 100644
--- a/doc/configuration.rst
+++ b/doc/configuration.rst
@@ -644,3 +644,31 @@ Hash the file using the following command::
 Finally, reload postfix::
 
   $ service postfix reload
+
+************************
+Auto-reply using Postfix
+************************
+
+The user that executes the autoreply script needs to access
+:file:`settings.py`. You must apply proper permissions on this file. For
+example, if :file:`settings.py` belongs to ``www-data:www-data``, you can add
+the ``vmail`` user to the ``www-data`` group and set the read permission
+for the group.
+
+To make Postfix use this feature, you need to update your
+configuration file as follows:
+
+``/etc/postfix/master.cf``::
+
+  autoreply unix        -       n       n       -       -       pipe
+            flags= user=vmail:<group> argv=python <modoboa_site>/manage.py autoreply $sender $mailbox
+
+Replace ``<driver>`` by the name of the database you
+use. ``<modoboa_site>`` is the path of your Modoboa instance.
+
+.. note::
+
+   Auto-reply messages are just sent once per sender for a
+   pre-defined time period. By default, this period is equal to 1 day
+   (86400s), you can adjust this value by modifying the **Automatic
+   reply timeout** parameter available in the online panel.
diff --git a/doc/index.rst b/doc/index.rst
index 6d00c2965..1496f5da4 100644
--- a/doc/index.rst
+++ b/doc/index.rst
@@ -32,9 +32,6 @@ And it is extensible by nature and comes with a lot of additional extensions:
 |`modoboa-pfxadmin-migrate                                |A tool to migrate from   |https://github.com/modoboa/modoboa-pfxadmin-migrate   |
 |<https://github.com/modoboa/modoboa-pfxadmin-migrate>`_  |Postfixadmin             |                                                      |
 +---------------------------------------------------------+-------------------------+------------------------------------------------------+
-|`modoboa-postfix-autoreply                               |Away message editor      |https://modoboa-postfix-autoreply.readthedocs.io      |
-|<https://github.com/modoboa/modoboa-postfix-autoreply>`_ |(postfix compatible)     |                                                      |
-+---------------------------------------------------------+-------------------------+------------------------------------------------------+
 |`modoboa-radicale                                        |A frontend for `Radicale |https://modoboa-radicale.readthedocs.io               |
 |<https://github.com/modoboa/modoboa-radicale>`_          |<http://radicale.org>`_  |                                                      |
 +---------------------------------------------------------+-------------------------+------------------------------------------------------+