From owner-freebsd-security  Tue Sep 19 22:33:40 2000
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Date: Tue, 19 Sep 2000 23:30:46 -0600
From: Colin Faber <cfaber@fpsn.net>
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To: Evren Yurtesen <yurtesen@ispro.net.tr>
Cc: "Chutima S." <chutima_s@zdnetonebox.com>,
	freebsd-security@FreeBSD.ORG
Subject: Re: How to prevent relaying host.
References: <Pine.BSF.4.21.0009200820010.82825-100000@finland.ispro.net.tr>
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Really the only way to allow any users with out limits for relaying is
to
have FEATURE(promiscuous_relay) in your m4 file, By default freebsd 3.4
should ban traffic to any outward domain if the sender isn't localhost.

Check your config, for 3.4 I believe you can find the default under
/usr/src/etc/sendmail/freebsd.mc


Evren Yurtesen wrote:
> 
> Are you sure you receive this email and your users are not sending
> them? Because I think the sendmail.cf in FreeBSD automatically blocks
> relaying as default by starting at version 3.1 I guess.
> how does your users send mail? they
> login to the machine and send or via smtp remotely?
> As it comes to m4 configuration I found it easy to go to
> /usr/src/contrib/sendmail/cf/cf and then fallow the instructions on
> sendmails web page (if you installed sources you can have this directory)
> there are also some sample configurations in there.
> Evren
> 
> 
> On Tue, 19 Sep 2000, Chutima S. wrote:
> 
> > Dear all
> >
> > I found that my host running FreeBSD 3.4 with sendmail version 8.9.3
> > have receive mail from strange people and target is not our users hundreds
> > messages a day.  Is it was relay host for some spam site?  How can I
> > reject those mail?
> >
> > I already visited www.sendmail.org and read about relaying host but I
> > don't understand M4 config, I know only I use /etc/sendmail.cf to config
> > my sendmail process. And /etc/mail contains only 2 file Makefile and
> > README.
> >
> > Thanks in advance,
> > Chutima Subsirin
> > chutima_s@zdnetonebox.com - email
> >
> >
> > ___________________________________________________________________
> > To get your own FREE ZDNet Onebox - FREE voicemail, email, and fax,
> > all in one place - sign up today at http://www.zdnetonebox.com
> >
> >
> >
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> >
> 
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