>Can you explain me a little this part?
>
> > Your mailserver has a reverse DNS entry, and geo.net.co has an A
> > record. Although they do not match, they are on the same Class C range.
There are a number of things that a mailserver can check, to make sure
incoming E-mail is coming from a "good" server.
It can check the reverse DNS entry of your mailserver. The reverse DNS
entry should exist (and in your case it does) -- the actual contents of the
reverse DNS entry should be irrelevant.
It can check the HELO/EHLO text of your mailserver, to make sure that it
has an associated MX or A record. In your case, it does.
That's all a remote mailserver really should do. They may also check to
make sure that the reverse DNS entry has an A record associated with it
(which yours do). So your DNS is good. However, some mailservers will do
more that they really shouldn't do -- such as making sure that the MX
record for the HELO/EHLO matches your IP, or matches the reverse DNS
entry. If they are running those tests, they are essentially saying they
don't care if they get your mail or not.
-Scott
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