That's weird, because my server is getting the HELO from gmail when I do a subdomain like that.
It just thinks that the "To" is external so it wants authentication.

I can do * for my MX record.

Alright, I'm gonna learn VBScript and make an SMTP External to External handler myself. Thank you!
When I am done hopefully I can edit this post to include my code.

I have multiple users and would like to forward from their subdomain of choice to the root domain to their account.
I can't do wildcard subdomains in aliases, plus if there were, I would have to create a new alias per user.

Hey there. I had a pleasant experience with hmailserver after spending days trying to set up postfix to no avail. I was wondering if I could have any subdomain forward to a root email using a rule or script? I found this was related: https://www.hmailserver.com/forum/viewtopic.php?t=20444 Although h...