I know there where serveral diffrent posts about this but my question is a little diffrent.
So I setup a new mailbox lets call it HR. I assigned additional email addresses to the mailbox so currently it has 3 email addresses configured:
I gave a user the Full permission to the mailbox and I also added the user to the list of users which have the 'Send on behalf permission' in the 'Delivery Options' of the mailbox. I then also changed the the primary email addres from email@example.com to firstname.lastname@example.org.
Now if the user puts email@example.com into the FROM field when he sends an email then the email is being delivered without a problem. But if he uses firstname.lastname@example.org. then he receives a bounce back mail with the following content:
Delivery has failed to these recipients or distribution lists:
You are not allowed to send this message because you are trying to send on behalf of another sender without permission to do so. Please verify that you are sending on behalf of the correct sender, or ask your system administrator to help you get the required permission.
Diagnostic information for administrators:
I did all these changes yesterday - so if these changes are not applied on exchange server right away by now they should, no?
What am I doing wrong? I need to enable the user to send emails from email@example.com