[stable26] feat: Mail account delegation

admin_manual/groupware/index.rst

@@ -6,4 +6,5 @@ Groupware
 .. toctree::
     :maxdepth: 2
 
-    calendar
+    calendar
+    mail

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.

user_manual/groupware/mail.rst

@@ -50,6 +50,16 @@ Your account settings such as:
 
 Can be found in the action menu of a mail account. There you can edit, add or remove settings depending on your need.
 
+Account delegation
+~~~~~~~~~~~~~~~~~~
+
+The app allows account delegation so that one user can send emails from the address of another.
+
+1) The delegation has to be configured on the mail server by an admin
+2) Add the other email address as an alias for your own email account
+3) When sending an email, select the alias as sender
+
+.. warning:: The sent email might not be visible to the original account if it's stored in your personal *Sent* mailbox.
 
 Compose messages
 ----------------