Re: Greylisting and whitelisting SMTP client domains

On Fri, May 06, 2005 at 08:00:03PM +0100, Matt Fretwell wrote:

> Victor Duchovni wrote:
>
> > > To clearify, whitelisting the sender domain works perfectly, but I
> > > also would like to whitelist some SMTP client domains. Right now I
> > > have:
> > >
> >
> > This is not possible in a semantically safe way. What happens when the
> > resolution of the client's name fails? Should their mail be blocked with
> > a 5XX code because they hit the blacklist after accidentally not being
> > found on the whitelist? How do you avoid erroneous 5XX rejects?
>
>
> In the context of bypassing greylisting, that scenario wouldn't arise.
>

This is because the response is already a 4XX response... This works,
but only so long as one expects the whitelist to exempt greylisting
rather than more general REJECT rules.

--
Viktor.

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