[TriLUG] mail server not accepting mail from my RR mail account

[Chris Merrill]

Just wanted to see if anybody else had run into this problem:
(I'm running Postfix on RH7.3)

I recently changed my dynamic DNS service provider from DNS2GO
to DynDNS.org.  After getting it setup, I tested sending myself
mail - from my RR account to my account in the domain I am hosting
on my box at home.  The mail was bounced.  I assumed that there
was something wrong with my configuration - so I read the FAQs at
DynDNS...which basically told me that if the machine resolving
to mydomain.net is the mail server, then I don't need to configure
MX records.  The mail server was working fine before I switched
DNS providers.

Today I tried sending mail to the account from my work account and
it got through.  It looks like mail coming from one of RR's servers
is not allowed to my server.  This was not the case when I first
configured Postfix on this machine (~14 months ago).

Has anyone else tried this lately?

If my conclusion is correct - then nobody with an @nc.rr.com
(or @rr.com?) mail address can send mail to my server  :(

*********************************
Chris Merrill
cmerrill at nc.rr.com
*********************************