Re: Fixed but no idea why.

Do I still need a domain in SMTP for my domain? Or will it find my
mail server fine now that my SMTP server has a different name?

When mail is destined for a domain, the only records consulted are the
MX and corresponding A records for that exact domain (not parent
domains, not subdomains). There's no "walking the tree" that occurs
in either direction.

Best practice is that you should have an MX record for any domain that
appears on the right-hand side of e-mails generated by your systems.
If you ever send mail from username@xxxxxxxxxxxxxxx, smtp.domain.com
should have an MX and corresponding A record. If you don't have an MX
record (that in turn points to an A record, like all MX records) you
still _must_ at least have an A record for smtp.domain.com. (This
latter option, while not encouraged, will work because the SMTP RFCs
specify that in the absence of an MX record, an A record for the
domain is to be used as an "implicit MX" record.)

Either way, the MX/implicit MX _must_ accept incoming connections on
port 25, and _must_ accept mail for every username that may be used to
generate mail.

I hope that gets a little closer to an answer for you.

--Sandy

.

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