[Mailman-Users] Another error - Services unavailable

[Heather J. Lubinsky]

Any idea why this would be happening?
I wonder if something is wrong with my server
Mailman 2.0.8 and Linux & apache
Heather

Return-Path: <MAILER-DAEMON at pcosupport.org>
Received: from localhost (localhost)
 by pcosupport.org (8.11.6/8.11.6) id h1S8PlL06733;
 Fri, 28 Feb 2003 00:25:47 -0800
Date: Fri, 28 Feb 2003 00:25:47 -0800
From: Mail Delivery Subsystem <MAILER-DAEMON at pcosupport.org>
Message-Id: <200302280825.h1S8PlL06733 at pcosupport.org>
To: postmaster at pcosupport.org
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
 boundary="h1S8PlL06733.1046420747/pcosupport.org"
Subject: Postmaster notify: see transcript for details
Auto-Submitted: auto-generated (postmaster-notification)
Status:   

This is a MIME-encapsulated message

--h1S8PlL06733.1046420747/pcosupport.org

The original message was received at Fri, 28 Feb 2003 00:25:47 -0800
from localhost
with id h1S8PlK06733

   ----- The following addresses had permanent fatal errors -----
<pcos-admin at pcolist.org>
    (reason: 550 5.0.0 Access denied)

   ----- Transcript of session follows -----
... while talking to mail.pcolist.org.:
>>> MAIL From:<>
<<< 550 5.0.0 Access denied
554 5.0.0 Service unavailable

--h1S8PlL06733.1046420747/pcosupport.org
Content-Type: message/delivery-status

Reporting-MTA: dns; pcosupport.org
Arrival-Date: Fri, 28 Feb 2003 00:25:47 -0800

Final-Recipient: RFC822; pcos-admin at pcolist.org
Action: failed
Status: 5.0.0
Diagnostic-Code: SMTP; 550 5.0.0 Access denied
Last-Attempt-Date: Fri, 28 Feb 2003 00:25:47 -0800

--h1S8PlL06733.1046420747/pcosupport.org
Content-Type: text/rfc822-headers

Return-Path: <MAILER-DAEMON>
Received: from localhost (localhost)
 by pcosupport.org (8.11.6/8.11.6) id h1S8PlK06733;
 Fri, 28 Feb 2003 00:25:47 -0800
Date: Fri, 28 Feb 2003 00:25:47 -0800
From: Mail Delivery Subsystem <MAILER-DAEMON>
Message-Id: <200302280825.h1S8PlK06733 at pcosupport.org>
To: <pcos-admin at pcolist.org>
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
 boundary="h1S8PlK06733.1046420747/pcosupport.org"
Content-Transfer-Encoding: 8bit
Subject: Returned mail: see transcript for details
Auto-Submitted: auto-generated (failure)

--h1S8PlL06733.1046420747/pcosupport.org--