I installed a mail in the box yesterday and so far so good, few small issues but I was able to work through them. Today I hit an issue that I can seem to get past, a error, “SMTP Error: The following recipients failed: Other@Person.com: : Sender address rejected: not owned by user user@mydomain.com”
I had an alias for info@ I deteled that made an account for info@ deleted that, tried to make another alias, I have added the email address to the send as for the alias, I have updated/rerun the install and it is still giving me the same error 
I would love some help please