This reminds me of a problem I had with a webmail provider. My
observation was that they weren't reading MX records. So if you send
email to host.domain.example (which has an A record but no MX ) it
worked. But if you send to mail.domain.example (with only an MX record
it was rejected).
They told me to ask the ISP for mail.domain.example as to why they were
rejecting it. So I "spoke" to the admin of the mail server (who happens
to be me) and there was no evidence of an attempt to connect.
So I tried again, watching the logs carefully. So I wrote back saying
the reason the mail is not getting through is that I don't believe you
are sening it to the right host.
So they said "ask the ISP for mail.domain.example why they were
rejecting it"
So I said "they are not rejecting, you are trying to send to the wrong
place"
So they said "ask the ISP for mail.domain.example why they were
rejecting it"
So I replied - I think you need to raise this with someone in your
company that understands MX records.
At which point I got <paste same reply in here> and decided to ditch the
company.
