I have the same issue, for workarround i have donde this
1. sudo nano /etc/postfix/virtual
2. added the mail addresses to forward. ie
test@mydomain.com pepe@hotmail.com3. Save the file and edit the line virtual_alias_maps in /etc/postfix/main.cf. The original is:
virtual_alias_maps = ldap:valiases change it to virtual_alias_maps = hash:/etc/postfix/virtual, ldap:valiases
4. Run: sudo postmap /etc/postfix/virtual, then reload postfix: sudo postfix reload
Then i edit the /usr/share/zentyal/stubs/mail/main.cf.mas, BUT the changes wont stay betewn resets