On Tue, 27 Jan 2004 12:58:23 +0000, Nigel Metheringham
<Nigel.Metheringham@???> wrote:
>These result from:-
> * Pump & dump spammers (ie connect to you and push a pile of stuff
> at you without worrying about little niceities of the protocol)
> * Open HTTP relays
> * Excessive delays on your box returning a SMTP banner - maybe due
> to long DNS timeouts, RFC1413 timeouts (especially when the
> caller is behind a firewall that drops port 113) or explicit
> delay statements. This means the calling box may fire a QUIT
> command at you before you have put out a banner because it got
> tired of waiting. This is particular problem with other hosts
> doing sender callback verification
* Network service checks that only see if the remote side is
still able to complete a TCP three-way handshake. Big Brother
is one of the more prominent examples of this species.
Greetings
Marc
--
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Marc Haber | " Questions are the | Mailadresse im Header
Karlsruhe, Germany | Beginning of Wisdom " | Fon: *49 721 966 32 15
Nordisch by Nature | Lt. Worf, TNG "Rightful Heir" | Fax: *49 721 966 31 29
