From owner-freebsd-security  Sun May  5 17:27:48 2002
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Date: Sun, 05 May 2002 19:27:35 -0500
To: Matthew Dillon <dillon@apollo.backplane.com>,
	Nils Holland <nils@daemon.tisys.org>
From: Christopher Schulte <schulte+freebsd@nospam.schulte.org>
Subject: Re: You've Been Removed!
Cc: Colin Faber <cfaber@fpsn.net>, security@FreeBSD.ORG
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At 05:13 PM 5/5/2002 -0700, Matthew Dillon wrote:
>     I think the lists should remain open.  A perfect solution would be
>     to have the mail system keep a database of originators (From: and
>     the first Received: header).  Whenever it sees an email from someone
>     not in the database it would request that the person acknowledge
>     that they really intended to send the email and, if they do, their
>     email goes through and they are added to the database (so it only
>     asks them once).
>
>     I've been contemplating writing such a beast for myself, since 90%
>     of the email I receive these days is spam.  I'm sure others have
>     written similar things so I'm wondering if there is a solution out
>     there already.  At some point I'm going to write mine (as a standalone
>     MX relay so it could be tied into any system), when I have more time
>     available.

Never used it personally, but this seems to do what you describe:

/usr/ports/mail/tmda
http://tmda.sourceforge.net/

>                                                 -Matt

--
Christopher Schulte
http://www.schulte.org/
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