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From: nichols@nvl.army.mil (Don Nichols)
Newsgroups: comp.unix.questions,comp.unix.misc,comp.unix.bsd.misc,comp.unix.bsd.bsdi.misc,comp.unix.admin,comp.security.unix,comp.security.misc
Subject: Re: Blocking domains that spam
Date: 24 Apr 1997 11:26:10 -0400
Organization: U.S. Army Night Vision & Electronic Sensors
Lines: 27
Message-ID: <5jnu2i$1al$1@izalco.nvl.army.mil>
References: <335eaf61.82196362@news.ioc.net>
Reply-To: nichols@nvl.army.mil
NNTP-Posting-Host: izalco.nvl.army.mil
Xref: euryale.cc.adfa.oz.au comp.unix.questions:98803 comp.unix.misc:28932 comp.unix.bsd.misc:3083 comp.unix.bsd.bsdi.misc:6744 comp.unix.admin:57339 comp.security.unix:33986 comp.security.misc:35462
In article <335eaf61.82196362@news.ioc.net>, <ken@ioc.net> wrote:
>I am using BSDI v2.1, does anyone know how to block email from a
>specific domain?
Well ... you've cross-posted this to several newsgroups, including a
couple of security ones (in one of which I'm reading and responding.) I'll
leave the cross-post, since I'm not sure where you'll be reading things.
Given that this is the comp.security.unix newsgroup (for me, at
least), *my* suggestion is to abandon sendmail entirely, install qmail
(which is *much* more secure, and which has a smtp receipt module which can
be started very quickly, so it can be run from inet.conf). Now, since it
can be run from inetd.conf, it can be tcp-wrapped. Tcp-wrapping can allow
quite a bit of control over who is allowed to connect, and who is not.
Also, qmail has a fairly easy configuration to make it reject
attempts to relay mail through your system, so as to bypass blocks that
others have against their own systems.
Good luck,
DoN.
--
DoN Nichols work:nichols@nvl.army.mil (703)704-2280
Disclaimer: No statements herein are to be considered as necessarily
representing the opinions of the Department of the Army or Night Vision Labs.
Black holes are where GOD is dividing by zero -- (author unknown)