Date: Wed, 17 Apr 2002 04:20:21 +0300 From: Giorgos Keramidas <keramida@ceid.upatras.gr> To: Sam <sam@wa4phy.net> Cc: questions@FreeBSD.ORG Subject: Re: rc.firewall rules help Message-ID: <20020417012021.GA28097@hades.hell.gr> In-Reply-To: <3CBC6847.5D03116B@vortex.wa4phy.net> References: <3CBC6847.5D03116B@vortex.wa4phy.net>
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On 2002-04-16 14:07, Sam wrote:
> Can someone give me some hints how to stop connections from spambots by
> refusing smtp or tcp connections from hosts who won't resolve via
> reverse lookup, or even forward lookup? Is the firewall script the
> appropriate place to put that, or would somewhere within sendmail be
> more better?
Sendmail by default does that already. You need to explicitly disable
it, by using either one or both of:
FEATURE(`accept_unqualified_senders')dnl
FEATURE(`accept_unresolvable_domains')dnl
Giorgos Keramidas FreeBSD Documentation Project
keramida@{freebsd.org,ceid.upatras.gr} http://www.FreeBSD.org/docproj/
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