Relaying denied to internal hosts

[Pete Zaitcev]

Pure genious:

From: Mail Delivery Subsystem <bouncer(a)redhat.com&gt;
To: <zaitcev(a)redhat.com&gt;
Subject: Returned mail: see transcript for details
Date: Fri, 10 Apr 2009 13:00:24 -0400

The original message was received at Fri, 10 Apr 2009 13:00:23 -0400
from vpn-12-123.rdu.redhat.com [10.11.12.123]

   ----- The following addresses had permanent fatal errors -----
<webmaster(a)fedoraproject.org&gt;
    (reason: 550 5.7.1 <[e-mail]>... Relaying
denied. IP name lookup failed [172.16.27.26])

   ----- Transcript of session follows -----
... while talking to mx1.util.phx.redhat.com.:
> >> DATA 
<<< 550 5.7.1
<[e-mail]>... Relaying denied. IP
name lookup failed [172.16.27.26]
550 5.1.1 <[e-mail]>... User unknown
<<< 503 5.0.0 Need RCPT (recipient)

-- Pete