Can't get any email

[JCrou82]

I've set up my DNS and mx records. I have multiple sites set up on my server and am using sendmail for the email portion of these sites. I've been able to set up the emial for all of my other sites, but i've registered a site and set up the dns and mx records and everytime i attempt to read test mail from another email account i get this email back:

The original message was received at Mon, 28 Jul 2003 10:49:29 -0400
from h-NN-NNN-NNN-NN.NYCMNY83.covad.net [NN.NNN.NNN.NL]

----- The following addresses had permanent fatal errors -----
<sales@mydomian.com>
(reason: system config error)

----- Transcript of session follows -----
553 5.3.5 mydomain.com. config error: mail loops back to me (MX problem?)
554 5.3.5 <sales@mydomain.com>... Local configuration error
550 5.1.1 otherusername... User unknown

can anyone help me out here. I've changed the output for security reasons. I've seen information on other sites but i dont' quite understand what they're talking about. What puzzles me is that everything is exactly the same for my other sites so I don't get why it doesn't work. So I can send but not receive

Thanks

 

[Rhinokiller]

make sure the new domain is set up in the access file
newdomain.com RELAY
and you re-hash the access.db
Also make sure the newdomain is listed in the relay-domains file.

There is no God, only 10001010