sendmail problems

[Omar M. Nafees]

Hello,

An 'mail loop back' error occurs whenever I send mail to myself. Here is
the Mail Delivery report:


The original message was received at Thu, 20 May 2004 10:40:00 -0400 (EDT)
from localhost.uwaterloo.ca [127.0.0.1]

   ----- The following addresses had permanent fatal errors -----
<root at hacker.cs.uwaterloo.ca>
    (reason: 553 5.3.5 system config error)

   ----- Transcript of session follows -----
553 5.3.5 hacker.cs.uwaterloo.ca. config error: mail loops back to me (MX problem?)
554 5.3.5 Local configuration error

    [ Part 2: "Delivery Status" ]

Reporting-MTA: dns; hacker.cs
Received-From-MTA: DNS; localhost.uwaterloo.ca
Arrival-Date: Thu, 20 May 2004 10:40:00 -0400 (EDT)

Final-Recipient: RFC822; root at hacker.cs.uwaterloo.ca
Action: failed
Status: 5.3.5
Diagnostic-Code: SMTP; 553 5.3.5 system config error
Last-Attempt-Date: Thu, 20 May 2004 10:40:00 -0400 (EDT)


    [ Part 3: "Included Message" ]

Date: Thu, 20 May 2004 10:39:59 -0400 (EDT)
From: Charlie ROOT <root at hacker.cs.uwaterloo.ca>
To: Charlie ROOT <root at hacker.cs.uwaterloo.ca>
Subject: test

test


**************************************************************

Any ideas as to what the 'local configuration error' could be? Where
should I be looking?


Thanks,
Omar