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Re: SMTP problem.

* Lars Roland Kristiansen (m00lrk@math.ku.dk) [020723 00:37]:
> Hi debian security geeks.
> I have a woody box running as a mail gateway with postfix (popbeforesmtp
> and local relay for and pop3 (soon to be imap just need
> outlook 2002 in the company as it supports multiple imap and pop3
> accounts). My problem is that my log seem to be running full of strange
> messages like these.
> Jul 23 06:17:53 mail postfix/smtpd[5472]: connect from
> unknown[]
> Jul 23 06:17:56 mail postfix/smtpd[5472]: disconnect from
> unknown[]
> Jul 23 06:17:58 mail postfix/smtpd[5468]: connect from
> unknown[]
> Jul 23 06:17:59 mail postfix/smtpd[5468]: disconnect from
> unknown[]
> I dont realy see why this is there it seams to come there in about 2-3
> sec. How do i track this down - i have a firewall in front of it and it is
> also running iptables - so it should be pretty secure but this should not
> be there should it ???.

This doesn't look particularly harmful, but if it is the "unknown" part
that is scaring you, try adding an entry for in /etc/hosts.
Other than that, it just looks like that host is making an smtp
connection and then later disconnecting. This will happen each time it
relays a message through you, and is nothing to be alarmed about (unless
you don't intend to be accepting mail from this host, but as I
understood your setup, that's exactly what you intend to be doing).

good times,
"Computer Science is no more about computers
than astronomy is about telescopes."  -- E.W. Dijkstra

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