From: Gary Mort (gmlugsaplings.us)
Date: Tue Jul 03 2007 - 17:41:57 CDT

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mouss wrote:
> the MX has nothing to do when sending email. the MX is for _receiving_
> mail.

Ok, to be more accurate:
In an environment where there is only 1 mailserver for both incoming and
outgoing email, I find it convenient to specify the MX servers are
authorized to send email.

Therefore, I make sure the reverse dns for the system matches the A
record for the MX server, and I make sure the server announces it's
domain name by using the MX server A record name(even though the server
is also called www.mydomain.com and mydomain.com)

Than if the website outgrows it's host and is moved, all those A records
will point to the new server, and the SPF record remains valid. So the
client won't come calling me saying their email started getting
rejected/sent tot he spam folder and has no need of contacting me at
all(of course, this assumes they followed my instruction to have the
reverse DNS on the new host point to the MX A name. For convenience
sake, I tend to use www.mydomain.com as the MX name as it is the address
most likely to be assigned to the reverse DNS if they think to ask but
forget exactly which name they were supposed to point it to)

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