[MM3-users] Re: MM3 Postfix FROM header issue

Mark,

I don't think the setup will work, as the client uses O365 for the emails and doesn't appear to like the virtual lists domain on the MM3 server. I've tried both using the O365 email connector as well Smtp2Go, both have the same issue with headers.

real email domain = example.org MM3 virtual domain = lists.example.org

The FROM: header is always what's causing the issue, plus it doesn't like any external emails as it can't send held messages or posts to users outside of the example.org domain.

I'm not sure if MM2 was setup differently, as the client used an on-prem SMTP relay with a virtual domain, then created internal contacts with external (virtual)/internal (real) email addresses attached.