diff --git a/admin_manual/groupware/index.rst b/admin_manual/groupware/index.rst
index 1670736e1..753447f16 100644
--- a/admin_manual/groupware/index.rst
+++ b/admin_manual/groupware/index.rst
@@ -6,4 +6,5 @@ Groupware
 .. toctree::
     :maxdepth: 2
 
-    calendar
\ No newline at end of file
+    calendar
+    mail
\ No newline at end of file
diff --git a/admin_manual/groupware/mail.rst b/admin_manual/groupware/mail.rst
new file mode 100644
index 000000000..dfd1e8ef8
--- /dev/null
+++ b/admin_manual/groupware/mail.rst
@@ -0,0 +1,12 @@
+====
+Mail
+====
+
+Account delegation
+------------------
+
+The Mail app supports account delegation if the delegation is handled by the mail server. That means the mail server has to accept emails sent from an alias address.
+
+In mailcow, for example, the setting is called *Also allowed to send as user*.
+
+.. warning:: Unless paired with shared *Sent* mailboxes or handled otherwise by the mail server, sent messages will be stored in the sender's personal *Sent* mailbox.