Lately I've seen MTA's based upon:

Symantec_AntiVirus_for_SMTP_Gateways

generating these kind of "delay" messages.  Verrrry anoooooying.  [Maybe
this is some "quarnatine" processing?]

Here's but one example.


<Begin Forward>
------------------------------ Message in error -------------------------------
Received: from mail.northeastmedical.org
  (mail.northeastmedical.org [166.82.104.147])
  by ES45.HSLC.ORG (PMDF V6.2 #30788)
  with SMTP id <[log in to unmask]> for owner-tvc-alert@LISTSERV
  (ORCPT [log in to unmask]); Fri, 22 Aug 2003 15:16:27 -0400 (EDT)
Date: Fri, 22 Aug 2003 15:16:26 -0400 (EDT)
Date-warning: Date header was inserted by ES45.HSLC.ORG
From: [log in to unmask]
Subject: Delivery failure notification
To: [log in to unmask]
Message-id: <[log in to unmask]>

Your message with Subject: TVC Alert, 22 August 2003
could not be delivered to the following recipients:

[log in to unmask]


Please do not resend your original message.

Delivery attempts will continue to be made for 5  day(s).
<End Forward>