From owner-freebsd-questions@FreeBSD.ORG  Thu Jun 19 05:51:33 2003
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Date: Thu, 19 Jun 2003 09:50:50 -0300 (ART)
From: Fernando Gleiser <fgleiser@cactus.fi.uba.ar>
To: Andreas =?iso-8859-1?Q?Wider=F8e?= Andersen <awand@pragma.no>
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cc: freebsd-questions@FreeBSD.ORG
Subject: Re: Do I have an open relay?
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On Thu, 19 Jun 2003, Andreas Wider=F8e Andersen wrote:

> Hi,
> I'm a bit nervous here. Recently I've started getting 20-25 mails to my
> Postmaster account on my FreeBSD 4.8RC server running Sendmail
> 8.12.8/8.12.8 each day with a message to Postmaster that the mail could n=
ot
> be delivered.

Sendmail by default does not relay, unless you enable PROMICUOUS_RELAY.
To test if you have an open relay, go to: http://www.abuse.net/relay.html
and run a test against your server.

It may be a "rumplestinkin attack", the spammers are trying to guess
account names in your server, postmaster gets a copy of the bounce. Look
at the logs for the full info.


=09=09=09Fer