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Date: Wed, 30 Apr 2014 14:59:25 -0500
From: Mike Sanders <tmp1@freebsd.hypermart.net>
To: freebsd-questions@freebsd.org
Subject: Respecting Privacy: How To Prevent Spam
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<http://staff.imsa.edu/~ckolar/mailman/mailman-administration-v2.html>

Under section 'Spam-specific posting filters':

Value: Hide the sender of a message, replacing it with the list address
(Removes From, Sender and Reply-To fields)

Description: This tells Mailman to rewrite the header so that traffic
appears to be coming from the list itself instead of the original poster.
Provides some added privacy for posters, but may be annoying to some list
members as mailbox headers show only the list name instead of the
actual poster.

-- 
Mike Sanders
www: http://freebsd.hypermart.net
gpg: 0xD94D4C13