With the new onslaught of viruses that my Zimbra server has been getting, I started getting a ton of undelivered notices in my Admin account. I already found the option to prevent backscatter in the admin, which cut them by half, however I still get a message for every virus that looks like this:

From:		MAILER-DAEMON@mail.example.com
Subject:	Undelivered Mail Returned to Sender
Date:		September 7, 2008 6:56:21 PM GMT-04:00
To:		admin@mailserver.example.com
<NOTE: the differing servers is not an accident, but the accounts are set up correctly>

This is the mail system at host mail.example.com...
<snipped boilerplate "could not be delivered" text>

<admin@mailserver.example.com>: mailserver.example.com
Reporting-MTA: dns; mail.example.com
Original-Envelope-Id: AM.......@mail.example.com
X-Postfix-Queue-ID: 71FF762E835
X-Postfix-Sender: rfc822; admin@mailserver.example.com
Arrival-Date: Sun,  7 Sep 2008 18:56:21 -0400 (EDT)

Final-Recipient: rfc822; admin@mailserver.example.com
Original-Recipient: rfc822;admin@mailserver.example.com
Action: failed
Status: 5.0.0
Diagnostic-Code: X-Postfix; mailserver.example.com

<original message then follows, with virus warning>
I can send a message to that account without error. It is just an alias for my account. Today alone I've received this message 14 times - which isn't a ton, but annoying none-the-less.

Is there something I can do to alleviate this? I've searched the forums, and there doesn't appear to be anyone else with this exact problem.