MIAB automatically sets up several aliases for you, like admin, administrator, postmaster, abuse, etc. Several of these aliases chain to one another, which is fine, because ultimately they chain (by default) to the original email account you set up. So, if I set bob@mydomain.com, then administrator references Bob, admin references administrator, abuse references admin, and postmaster references administrator, etc. That’s all fine-- If you send an email to any of those aliases, Bob gets is. HOWEVER… He can’t send from any of them that don’t directly reference Bob.
It seem sto me that, as the default setting for an alias is that any address that the alias forwards to can send from it, then when MIAB validates an outbound email that’s coming from an alias, it should follow the chain. So, if the email is being sent from postmaster, which references admin which references administrator which references Bob… Then it shoudl allow it. Currently, it does not. So, I have to create a postmmaster alias and explicitly forward it to Bob, then it will work (and, fortunately, MIAB does remove the “default” one that it put in there that forwards to administrator). For some reason, it won’t let you edit those default ones though. I don’t know what happens now that I’ve added a new one if I delete it… Will MIAB add back the default one.