I've been arguing with my registrar and host (1and1.com) about an odd problem with an email forwarding address, and I can't get any further until I know how they work.
What I know is that:
mydomain.comhas an MX record listing
- I can configure
email@example.com forward to one or more other email addresses, without creating a mailbox at 1and1.com for
There is a peculiar problem involving email from a particular outside sender never reaching the end mailboxes when sent through one forwarding address, and also not bouncing or rejecting to the sender. (But they do reach the end mailboxes when sent directly, without going through the forwarding address configured at 1and1.com.)
1and1.com claims that because a pure forwarding address has no mailbox they have "nothing to do" with the delivery failure. The last tech I spoke to even said that the domain's MX record has nothing to do with delivery if 1and1.com isn't hosting the mailbox.
I assert that they must have something to do with it, because only 1and1.com knows where I have asked mails to
firstname.lastname@example.org to be directed. But I don't know what I can specifically assert must be occurring during this forwarding process, and hence what logs must exist on 1and1.com servers that could illuminate the (presently silent) delivery failure.
Based on the protocols, is it possible to say how an external mail sender would try to interact with 1and1.com to deliver a message addressed to
email@example.com, when that is a pure forwarding address (a.k.a. "email alias") and
mydomain.com lists NS, A, and MX records at 1and1.com?