full-disclosure - Administrivia: Duplicate Messages

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From: len at netsys.com (Len Rose)
Subject: Administrivia: Duplicate Messages

These duplicates are being re-injected after being sent
to a subscriber of the vulnwatch mailing list who is
also subscribed to this list. We see the same behaviour
from users who are subscribed to the bugtraq list.

The common denominator is that the original message to
Full Disclosure also had multiple To: entries for
the above lists, and that the recipient is using 
Micro$oft mail servers.

So even though it was seen and transmitted to the Full
Disclosure list (often days before) it gets re-transmitted
because the stupid Micro$oft will apparently resend to
any other address found on the To: line.

We have no recourse other than to hope that the site
disappears (in this case it was allergan.com and their
Micro$oft Exchange server) or put up with duplicate messages
arriving days afterwards when the other lists finally
send out the same message.

I've just manually deleted 150k duplicates from the outgoing
mail queues, there were about 4 or 5 messages re-injected from
that site.