According to James P. Roberts:
> > On Thu, 26 Jun 2003, Cihan Subasi (Garanti Teknoloji) wrote:
> > > The server queries ip address all over the world...Think that this is a
> > > client smtp server doing reverse ip control for every mx record...
> >
>
> Umm... You do know why an SMTP server does this, right? To block spam?
>
> I'm not saying you shouldn't cut them off. I'm just saying, make
> sure it's really what you want to do.
>
> Perhaps you could (also) suggest they put a caching-only BIND service
> on their SMTP server, and do their own rDNS queries.
Maybe it's also the case that your reverse zone has the ttl set way too
low which causes this exact behaviour (by setting the ttl very low, you
basically disable caching of the record and any will result in many queries).
-Ed
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