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Date:      Wed, 26 Aug 1998 18:15:40 +0100
From:      Adam Nealis <adamn@criterion.canon.co.uk>
To:        pat.groce@state.sd.us
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   Re: SPAM HELP
Message-ID:  <35E442BC.7D296EC3@criterion.canon.co.uk>
References:  <5D2C95997022D21187350008C7F4CF7902EDFB@ESPR1SRV5>

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pat.groce@state.sd.us wrote:

> Our freebsd box is currently being used for redirected spam messages.
> Sometimes 6000-7000 messages a day! Any idea on how i can prevent this?
> Is there a web page or other resource covering this topic? On
> freebsd.org i found some stuff on filtering inbound spam but nothing on
> this redirection problem.

It sounds like you are being used as a "SPAM relay". You need to prevent
unauthorised hosts from doing this.

Pay a visit tohttp://www.informatik.uni-kiel.de/%7Eca/email/check.html

and read the lot, but you really want the check_relay stuff. Basically you
prevent e-mail from being sent via your mail server.

Adam.


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