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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