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From: igor@alecto.physics.uiuc.edu (Igor Roshchin)
Message-Id: <199710160151.UAA17669@alecto.physics.uiuc.edu>
Subject: Re: Anti-spam sendmail in 2.2.5?
To: root@eyelab.psy.msu.edu (Gary Schrock)
Date: Wed, 15 Oct 1997 20:51:56 -0500 (CDT)
Cc: don@PartsNow.com, freebsd-stable@FreeBSD.ORG
In-Reply-To: <199710160121.VAA18333@eyelab.psy.msu.edu> from "Gary Schrock" at Oct 15, 97 08:25:07 pm
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Probably, I missing something, but I see 
a rather logical configuration as follows:
 
1. There is a list of hosts allowed to send messages through
the server in question. Such list can be in sendmail.cf or in a
separate file, such as /etc/allowedtorelay, and can include
wildcards in order to contain the whole subdomains, e.g.
*.domain.com or 128.174.83.* (and/or using IP-mask)

(Remark: Limitation to the local host is too strict
and not appropriate for many situations, especially if you
are using one "postoffice" server as a "smart-host" to relay
the e-mail to everywhere outside. 

2. Pop-clients :
a) If the client is in the same domain than this situation yields 1. 
b) If the client is coming from any other domain (and not from a fixed list
which can be included by a special request to the administrator)
e.g. if somebody is using PPP from a personal ISP to read e-mails
from the business account, than that ISP should provide mail-server
(postoffice, etc.) which shell accept e-mails from any of the 
PPP/SLIP computers.


Hope this helps.

IgoR