Hi. This is not possible for the moment. SOGo only display available mail field from LDAP in the drop-down list, and SME doesn't support several mail fields (well, you can manually add additional mail attributes with phpldapadmin for example, but the changes will be lost the next time the user is modified, or when you run post-upgrade/reboot).A feature request is opened in sogo bugtracker to address the issue: http://sogo.nu/bugs/view.php?id=694. Basically, SOGo should let users enter any From address, regardless of LDAP content.
Well, everything is possible, but it needs some development, and development costs time. Further more, I think it'd more flexible if this is implemented in SOGo, so that we can enter any From address.
Hi. This is not possible for the moment. SOGo only display available mail field from LDAP in the drop-down list, and SME doesn't support several mail fields (well, you can manually add additional mail attributes with phpldapadmin for example, but the changes will be lost the next time the user is modified, or when you run post-upgrade/reboot).