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From: David Southwell <david@vizion2000.net>
Organization: Voice and Vision
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Date: Thu, 4 Oct 2007 10:12:31 -0700
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Message-Id: <200710041012.31295.david@vizion2000.net>
Subject: Suitable port mail reject repeaters
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Hi=20

There have been numerous attempts on one server resulting in entries of the=
=20
following type in the log:( [xxxx] is a domain for which we receive mail).)

Oct =A03 07:05:39 dns1 postfix/smtpd[93611]: connect from=20
mail.dolbeyco.com[70.61.148.178]
Oct =A03 07:05:40 dns1 postfix/smtpd[93611]: NOQUEUE: reject: RCPT from=20
mail.dolbeyco.com[70.61.148.178]: 450 4.1.1 <Novitsky@[xxxxx]>: Recipient=20
address rejected: User unknown in virtual alias table; from=3D<>=20
to=3D<Novitsky@[xxxxx].com> proto=3DESMTP helo=3D<FRODO.DOLBEY.priv>
Oct =A03 07:05:40 dns1 postfix/smtpd[93611]: disconnect from=20
mail.dolbeyco.com[70.61.148.178]=20

Where clearly the remote server is hoping to find we are either open to=20
relaying messages or probing to find email addresses we will accept.

users with names that do not exist in the virtual alias table are being=20
rejected. However the same group of servers seem to keep on repeated failed=
=20
attempts.


What I would like to do is after receiving a number of attempts from a such=
 a=20
remote server to automatically refuse connections and reduce the log load. =
I=20
believe there is a tool for doing that (say after a remote server has a=20
speciofied number of failed attempts). I am sure there is a port that does=
=20
this but cannot find it!!