A commit to Fedora non-pkg CVS triggered the following:
[...]
Begin forwarded message:
Date: Mon, 21 Jul 2008 20:28:08 -0400
From: Mail Delivery Subsystem <MAILER-DAEMON(a)redhat.com>
To: mschwendt
Subject: Returned mail: see transcript for details
The original message was received at Mon, 21 Jul 2008 20:28:07 -0400
from
bastion.fedora.phx.redhat.com [10.8.34.50]
----- The following addresses had permanent fatal errors -----
<cvsextras(a)fedora.redhat.com>
(reason: 554 5.7.1 <cvsextras(a)fedora.redhat.com>: Relay access denied)
----- Transcript of session follows -----
... while talking to mail-int.fedora.redhat.com.:
>> DATA
<<< 554 5.7.1
<cvsextras(a)fedora.redhat.com>: Relay access denied
554 5.0.0 Service unavailable
<<< 554 5.5.1 Error: no valid recipients
--