Date: Fri, 25 Aug 2006 15:03:32 -0500 From: Derek Ragona <derek@computinginnovations.com> To: Brett Glass <brett@lariat.net>, questions@freebsd.org Subject: Re: "Hostile" vs. "Friendly" instances of Sendmail Message-ID: <6.0.0.22.2.20060825150253.026baa68@mail.computinginnovations.com> In-Reply-To: <7.0.1.0.2.20060825134436.0a366aa0@lariat.net> References: <7.0.1.0.2.20060825134436.0a366aa0@lariat.net>
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-Derek
At 02:57 PM 8/25/2006, Brett Glass wrote:
>A company for whom I do consulting has a FreeBSD mail server. Because
>they're being deluged with connections from spammers (who have responded
>to the increasing use of "graylisting" by ordering their armies of bots to
>try again and again even when spam is rejected), they've subscribed to
>some DNS blacklists and set Sendmail to limit the number of processes it
>can spawn at any one time. This reduces the load on the system due to
>spamming, but also prevents internal users from getting the mail server's
>attention when they want to send legitimate outgoing mail.
>
>What's the best way to set things up so that more trusted, internal users
>can access their own instance of Sendmail (with less restrictive process
>limits, no blacklist checks, etc.) while the outside world sees an
>instance of Sendmail with blacklisting, process limits, connection limits,
>load limits, etc.? Will there be problems with file locking, queues, etc.
>if a third instance of Sendmail is started on a standard FreeBSD install
>(which normally runs two)? And where's the option that tells Sendmail to
>listen only on a particular interface? (This should be on the man page,
>but isn't.)
>
>--Brett Glass
>
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