I’ve two users, let’s call them “userA” and “userB”. Both users are using WebApp. UserA should be able to send as userB. This is a no-brainer. Do the configuration on the ldap server, check with “kopano-admin --list-sendas userB” and everything works as expected.
Now for the tricky part: What if userB has some aliases (LDAP attribute: mailAlternativeAddress) configured (user_b@domain, b@domain, etc). UserA wants to send an email as userB but instead of using the primery address (userB@domain), userA wants to use one of these aliases (i.e. b@domain) as the sender address. This doesn’t work.
Everytime userA is trying to send this email, he get’s the following error message:
Unfortunately, I was unable to deliver your mail. The error given was: You are not allowed to send as user or group Info Mittelstandstag You may need to contact your e-mail administrator to solve this problem.
So, the question is: how do I configure this?