Mail Failed

There was an error sending the mail test:

Error sending to  (554 : Relay access denied)



Log : Mail::Sendmail v. 0.77 - Tue Oct  7 00:02:18 2008
Date: Tue, 7 Oct 2008 00:02 -0600
Server: mail.xnet.com Port: 25
From: pro@de-srv.com
Subject: mail test from prohosting.com
To: !Failed: efflandt@xnet.com