(21-07-2017, 07:54 AM)z3bra Wrote: Also, I don't get your remark about CNAME. They are meant for domain aliases, and I'm using them as such.

I just checked, in this case it's explicitly forbidden, according to RFC1821, under point 10.3:

Quote:It can also have other RRs, but never a CNAME RR.

An MX-record MUST never refer to a CNAME. So it might as well be that this is the root cause of your problem. Additionally, you could be in violation of RFC1034:

Quote:If a CNAME RR is present at a node, no other data should be present;

What I mean with my, admittedly snarky, comment was, that I don't see the point in naming your mailserver orbb, when you're making an alias for it. Why not pointing the MX-record towards orbb in the first place?