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Subject: Re: RBL use and unavailable RBL servers
From: Wietse Venema (wietseporcupine.org)
Date: Wed Nov 01 2000 - 15:01:07 CST

Len Conrad:
> AAll DNS lookups are subject to timeout, and RBL is no exception.
> >If RBL lookup times out the mail will be received.
> >
> > Wietse
>
> I follow the Lyris list. They're currently complaining about Yahoo's
> very slow SMTPD's effectively tarpitting large percentages of Lyris'
> SMTP processes, effectively slowing overall Lyris deliveries.
>
> How would postfix react to such slow SMTPD sessions and can postfix
> be made more "impatient" to decide more quickly to abort the
> sesssion, defer the msg, and free up its SMTP client process slot?

I would recommend running more SMTP client processes instead.
The slow sites would tie up some number of SMTP clients, but
the rest of the SMTP clients would deliver at full speed.

        Wietse