While we're on the topic of DNS, I've noticed some of the newer MX records aren't properly functioning for some reason. gmx/gmail/yahoo and some of the other more local ISPs ie: Optonline, Comcast, Cox mail systems can't resolve some of the newer entries.
I have seen cases where a point within a domain has their own MX records, and others also exist but one contains an error, the rest of the MX records may get ignored. As it stands now, n1rcw.ampr.org is resolvable as a point within ampr.org but it's MX record (which does properly exist) is showing unresovable by some of the above mentioned mail servers.
It's always good to keep DNS records as error free as possible as funky things can (and most likely will) happen because of such.