help a lesser figure out mail servers

#1
So, I'm new to the whole vps hosting but i've got my domain going. The only problem I've got is the email. This is the first time I've set up a *nix mail system. I'm just wondering if someone could help me out a bit with a few questions i'm having.
On outgoing mail, the domain reported is whatevername@host.modern-radio.com I'd like to have that just be whatevername@modern-radio.com, how do i go about accomplishing this?
Also, emails to addresses at aol.com seem to be bouncing with this error:

The original message was received at Mon, 29 Oct 2007 10:42:52 -0400
from host.modern-radio.com [127.0.0.1]

----- The following addresses had permanent fatal errors -----
<xxxxxxx@aol.com>
(reason: 550 REQUESTED ACTION NOT TAKEN: DNS FAILURE)

----- Transcript of session follows -----
... while talking to mailin-01.mx.aol.com.:
>>> MAIL From:<xxxxxxx@host.modern-radio.com>
<<< 550 REQUESTED ACTION NOT TAKEN: DNS FAILURE
554 5.0.0 Service unavailable


Any help would be GREATLY appreciated. I know my way around linux just fine, i'm just a little green when it comes to this mail server stuff.
Justin
 
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