Re: [Exim] Synchronization Error

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Autor: Marc Haber
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A: exim-users
Assumpte: Re: [Exim] Synchronization Error
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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