[Greylist-users] some comments on spamd

A.L.Lambert madmin at xjack.org
Tue May 31 11:41:43 PDT 2005

> Do you, or anyone else, have any indication on the amount of false
> positives with greylisting? I've disabled greylisting on a site because
> several people complained that their mail didn't get through. It seems
> that some mailers are confused by a 4xx result at an unexpected location
> and drop that e-mail.
> That is of course a bug in the sending MTA, but I find disappearing
> e-mail highly disconcerning even if it is only a very, very tiny  fraction
> of all e-mail.
> If it weren't for those disappearing e-mail I'd never disable  greylisting,
> we also got a 90+% decrease in the amount of incoming spam and e-mail
> virusses.

	Are you 100% positive sending mailers were 'dropping' the messages in
question without making any kind of bounce?   I run greylisting on a
variety of servers (one of which crunches about 60,000 real deliveries a
day, not counting a few hundred thousand rejects), and I've had 0
confirmed reports of lost mail that never generated a bounce of some
kind.   I've had some user complaints stating that, but all of them
turned out to be user errror or some kind.

	Anyway, just curious.


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