Re: [Exim] DNSBL Question/Alert

[ On Wednesday, January 8, 2003 at 22:13:12 (-0500), James P. Roberts wrote: ]
> Subject: Re: [Exim] DNSBL Question/Alert
>
> > [ On Wednesday, January 8, 2003 at 10:07:47 (-0000), Mark Douglas wrote: ]
> > > Subject: Re: [Exim] DNSBL Question/Alert
> > >
> > > > the (Osirusoft) DNS blocking list check began timing out
> > >
> > > Yesterday morning I was caught by this. Most SMTP connections were
> > > timing out and we eventually traced it to the Osirusoft lookup
> > > hanging. I removed that lookup and things seem normal.
> >
> > If most of your SMTP client connections were timing out when a DNSBL was
> > unavailable then either your SMTP client are _very_ poor quality and
> > non-standard implementations, or your DNS resolver is waiting far too
> > long for responses.
>
> I would disagree with your above assessment. It wasn't the SMTP client
> connections that were timing out.
>
> The connections were being deferred due to the "+defer_unknowns" option
> on the DNSBL lookups.

OK, well it sure does help to get one's facts straight before
complaining about the wrong thing! I could only assume that Mark meant
"connections were timing out" when he wrote "connections were timing
out" above.

--
                                Greg A. Woods

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