[100932] in RedHat Linux List
Re: log entry question
daemon@ATHENA.MIT.EDU (Chuck Mead)
Mon Nov 23 20:35:10 1998
Date: Mon, 23 Nov 1998 20:35:54 -0500 (EST)
From: Chuck Mead <chuck@moongroup.com>
To: redhat-list@redhat.com
In-Reply-To: <3.0.5.32.19981123125336.007d1100@fmol.5sigcmd.army.mil>
Resent-From: redhat-list@redhat.com
Reply-To: redhat-list@redhat.com
On Mon, 23 Nov 1998, Anthony E. Greene wrote:
> At 11:16 1998-11-23 +0000, Thomas Ribbrock (Design/DEG) wrote:
> >> As for SPAM... yes, I would imagine that someone could use you
> >> as a SPAM relay. I know zero about sendmail (I use qmail), so
> >> I am clueless about how to configure sendmail to protect against
> >> this, but it *is* a feature of Sendmail to be able to guard
> >> against it. However, you have to set it up.
> >
> >Looks like I better have a look into that one. I'd hate to have my machine
> >abused...
>
> Take a look at /etc/mail/ip_allow, relay_allow, and name_allow. You can set
> the range of hosts that may relay through your server using ip_allow and
> name_allow.
>
> You can set the domains you will relay to using relay_allow. Most SPAM
> probelms can be solved using ip_allow and/or name_allow. I set mine to
> allow relaying only from IP addresses on one of my organization's subnets.
> If your subnet looks like 123.456.789.0 then you can restrict relaying by
> editing ip_allow to add the line:
>
> 123.456.789
>
> Note that the above is not a valid IP address and is used only as an
> example.
I would not make a serious anti-spam effort with sendmail 8.8.7 (the
default MTA which comes with 5.1). I'd use sendmail 8.9.1-2 which is
available via rpm from sunsite.unc.edu.
The FAQ at http://www.sendmail.org is an excellent repository of
knowledge on this version and ORBS and the RBL can also help with
limiting relay access and/or connections to your box.
I am in the process of redoing my Moongroup site pointing squarely at
these issues. Those on the mailhelp list will see the changes first
<grin>!
Cheers!
--
Chuck Mead, CEO - Moongroup Consulting, Inc. <chuck@moongroup.com>
http://www.moongroup.com/
http://www.moongroup.com/unix/
There's no such thing as a free lunch.
-- Milton Friendman
--
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