Suitable port mail reject repeaters
David Southwell
david at vizion2000.net
Thu Oct 4 09:56:37 PDT 2007
Hi
There have been numerous attempts on one server resulting in entries of the
following type in the log:( [xxxx] is a domain for which we receive mail).)
Oct 3 07:05:39 dns1 postfix/smtpd[93611]: connect from
mail.dolbeyco.com[70.61.148.178]
Oct 3 07:05:40 dns1 postfix/smtpd[93611]: NOQUEUE: reject: RCPT from
mail.dolbeyco.com[70.61.148.178]: 450 4.1.1 <Novitsky@[xxxxx]>: Recipient
address rejected: User unknown in virtual alias table; from=<>
to=<Novitsky@[xxxxx].com> proto=ESMTP helo=<FRODO.DOLBEY.priv>
Oct 3 07:05:40 dns1 postfix/smtpd[93611]: disconnect from
mail.dolbeyco.com[70.61.148.178]
Where clearly the remote server is hoping to find we are either open to
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
rejected. However the same group of servers seem to keep on repeated failed
attempts.
What I would like to do is after receiving a number of attempts from a such a
remote server to automatically refuse connections and reduce the log load. I
believe there is a tool for doing that (say after a remote server has a
speciofied number of failed attempts). I am sure there is a port that does
this but cannot find it!!
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