Date: Wed, 23 May 2007 07:17:07 +0100 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: Maxim Khitrov <mkhitrov@gmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: Sendmail ignores hosts.allow Message-ID: <4653DC63.4080609@infracaninophile.co.uk> In-Reply-To: <26ddd1750705221321n39d72034m3773ecce8ab49da1@mail.gmail.com> References: <26ddd1750705211537j78ed83fdm921f7f5e5df5c4@mail.gmail.com> <20070522105732.A2743@erienet.net> <26ddd1750705220837n141787fdh6167c0cb07a8396f@mail.gmail.com> <20070522121629.X86945@fledge.watson.org> <26ddd1750705221046m543c427ahf9c73878d14f6e2a@mail.gmail.com> <9355E7E0-1B92-40A1-BDB2-D17FD1815814@lafn.org> <465340C0.3040705@xxiii.com> <26ddd1750705221321n39d72034m3773ecce8ab49da1@mail.gmail.com>
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Maxim Khitrov wrote:
> Do you know
> if there is a reason they chose to do it this way? Accept the
> connection, but don't allow the client to do anything with it?
If sendmail just dropped the connection, then the sending MTA would
retry the message, potentially every 15 minutes for up to 5 days.
The way sendmail does it, the sending MTA gets a 5xx permanent
error message straight away, meaning it tries once and then fails.
Of course, that assumes the MTAs involved are doing something like
following the appropriate RFCs, which most of the spambots fail to
do.
Cheers,
Matthew
- --
Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard
Flat 3
PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate
Kent, CT11 9PW
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