[ILUG] Re: [GLUG-tech] exim and grey listing

[Belgarath]

On Thursday 02 August 2007 19:58:07 Cian Davis wrote:
> Colm Buckley wrote:
> > On 02/08/07, Daniel Shaw <dshaw78 at gmail.com> wrote:
> >>> How well does grey listing work ?
> >>
> >> Very very very well.
> >
> > If you can live with the false positive rate.  Which is nonzero
>
> I do agree that it works very, very well but there is a gotcha.
> Depending on the sending MTA, the delay can be minutes or hours. I
> would imagine that business people would be unwilling to wait that
> long. It does become a PITA every now and again. However, it's cut my
> spam from >150/day to about 5-6 a day.

Well it depends on the implementation my graylist blocks only first attempt 
form the e-amil adres/ip hash so if sombody sends a message again it goes 
through the db is kept for one month so only the first message is delayed :)