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Posted by Greg Hennessy on June 30, 2005, 8:57 pm
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On 30 Jun 2005 12:24:53 -0700, bhodgins@idirect.ca wrote:
>Tracing this, I find that the mail leaves our network, reaches the
>destination mail server, then times out, comes back and sits in our
>queue for a retry.
The entire 'mail' leaves the network or the just part of the 3 way
handshake ?
Mail does not 'come back'. it either gets delivered or it doesnt.
Have you sniffed the traffic on the wire as it leaves your network ?
>When I talked to the client we had a problem sending mail to, he
>observed that we were sending a lot of "out of state" packets coming
>into his Checkpoint Firewall. His systems were in turn sending "out of
>state" packets back.
He's taking rubbish, no firewall I know of, sends 'out of state' packets
anywhere. Let alone back to the source.
Is he running some form of anti spam black holing ?
>I figure this was his anti-spam requesting some
>data from our mail server.
>
>We have this problem with about 5 companies so far, including anyone at
>a hotmail address.
1st question, have you checked *your* logs for inbound connections on
113/tcp from the remote mail server during the outbound mail session.
2nd question, are you sending back an RST for all connections to 113/tcp
rather than just ignoring it all together ?
greg
--
"Access to a waiting list is not access to health care"
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