Slow mail sending from Windows XP

[Dr Jonathan Knight]

We've just noticed that sending email from Windows XP boxes was going
slow.  There was a three second delay on connecting to exim before the
welcome banner appeared.

The problem seems to be that Windows XP firewall now quietly drops
RFC1413 requests (or at least not answer them very quickly) whereas it
used to reject them.

I've had to put "rfc1413_hosts=!*" into my config files to get the speed
back up.  The default for this option is to test every host.

Jon.

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[Heiko Schlittermann]

Jonathan Knight <j.knight@...> (Mi 01 Jul 2009 11:57:37 CEST):

>
> We've just noticed that sending email from Windows XP boxes was going
> slow.  There was a three second delay on connecting to exim before the
> welcome banner appeared.
>
> The problem seems to be that Windows XP firewall now quietly drops
> RFC1413 requests (or at least not answer them very quickly) whereas it
> used to reject them.
>
> I've had to put "rfc1413_hosts=!*" into my config files to get the speed
> back up.  The default for this option is to test every host.
>

rfc1413_hosts =
(empty value) would have done the same, but probably cheaper.
The spec recommends setting the assiciated rfc1413_query_timeout to 0s,
since this skips ident callouts at all.

    Best regards from Dresden/Germany
    Viele Grüße aus Dresden
    Heiko Schlittermann
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