[Greylist-users] some comments on spamd
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
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.
More information about the Greylist-users