On 2023-01-10 at 13:59 -0800, Dan Mahoney wrote: > The way postfix handles these aliases, is that it preserves the > original envelope sender and recipient (which we don’t want anyway), > and o365 is rejecting on that envelope sender/recipient (that it’s > not allowed to deliver to our internal envelope recipient, which is > not unreasonable, but still surprising we haven’t hit it before.
Postfix is keeping the alias as envelope recipient?? Or just in the To: header? I think O365 is simply seeing that the sender is a mail it should be handling itself but the mail comes from outside and rejects it. I'm sure it's possible to configure it to allow that. I don't know how to do that, though. Marking the sender and external and the postfix IP as trusted, probably. Regards _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
