From owner-freebsd-hackers  Wed Sep  5  9:58:52 2001
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Date: Wed, 5 Sep 2001 09:58:44 -0700
From: Gregory Neil Shapiro <gshapiro@FreeBSD.ORG>
To: Igor Podlesny <poige@morning.ru>
Cc: freebsd-isp@FreeBSD.ORG, hackers@FreeBSD.ORG
Subject: Re: auto relaying for subdomains -- why?
In-Reply-To: <16615694707.20010905210719@morning.ru>
References: <16615694707.20010905210719@morning.ru>
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poige> I  noticed  that  some  mailers (sendmail, postfix) in case they a=
llow
poige> relaying    for    somedomain.zone    also    allow    relaying   =
 for
poige> subdomain-of.somedomain.zone.

poige> I can accept this as reasonable behavior but would like to know ho=
w to
poige> deny it! :) Also I wish to know what was the actual idea behind th=
is?

=46rom /usr/share/sendmail/cf/README:

+----------+
| FEATURES |
+----------+
=2E..
Available features are:
=2E..
relay_hosts_only
		By default, names that are listed as RELAY in the access
		db and class {R} are domain names, not host names.
		For example, if you specify ``foo.com'', then mail to or
		from foo.com, abc.foo.com, or a.very.deep.domain.foo.com
		will all be accepted for relaying.  This feature changes
		the behaviour to lookup individual host names only.

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