In this case, so I wasn't cluttering anyone else's mailbox, I set up the username testing, which has firstname.lastname@example.org
as an alias, just so I could confirm the behaviour with a fresh email. (The original user who noticed the problem is on another site I host.) The user testing then forwards to email@example.com
The original notice was when a PHP script mailed to an alias - I got the undeliverable message error, since wwwrun's email forwards to me. I also tried sending to firstname.lastname@example.org
, with the same result (info is an alias for markanthony).