Quoting Eric F Crist (ecrist at ardent-hacker.net):
> "The message could not be sent because one of the recipient was rejected by the server. Server Response: '550.7.1 <wraith888 at mediaone.net>...Relaying denied'. (Account: 'ShadowWraith', SMTP Server: 'mail.shadowwraith.net', Error Number 0x800ccc79).
> 
> How do I fix this?  I've dealt with it before, but I don't remember!
> I know it has somthing to do with sendmail.cw and access, but I don't know what
> the right way to do it is.

Sendmail?

Add domain to your /etc/mail/access file.
-- 
Bob Tanner <tanner at real-time.com>       | Phone : (612)943-8700
http://www.mn-linux.org                 | Fax   : (612)943-8500
Key fingerprint =  6C E9 51 4F D5 3E 4C 66 62 A9 10 E5 35 85 39 D9