In outlook 2010 I can send from and enter an email but when I send an email from my alias it comes back as
You can't send a message on behalf of this user unless you have permission to do so.
The email I'm using is my alias from the second domain.
email@example.com is my main email address
firstname.lastname@example.org is my alias and I can't sent emails from the alias email.
I have tried to enabled Send As but it only lets me select from the list of users not my alias email form the other domain. Also tried delegation but does not work either.
Can someone help?