[Greylist-users] some comments on spamd
ronaldoussoren at mac.com
Tue May 31 10:37:24 PDT 2005
On 31-mei-2005, at 19:17, Graham Toal wrote:
> A final update on my saga of building a greylist server using spamd...
> It has been live in front of the University of Texas Pan American for
> two weeks now. I am using greylisting plus a small list of
> IPs which I built myself by observing the traffic hitting the greylist
> and then checking each IP against other blacklists to make sure they
> were indeed bad networks.
> We have cut down incoming spam by 90%. We now get one spam per good
> mail instead of 10 spams per good mail. We reject over 80,000
> *connections* per day from spammers, and presumably far more actual
> spam deliveries than than (as many of the connections would have sent
> to every user on campus - 15,000+)
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
of all e-mail.
If it weren't for those disappearing e-mail I'd never disable
we also got a 90+% decrease in the amount of incoming spam and e-mail
-------------- next part --------------
A non-text attachment was scrubbed...
Size: 2105 bytes
Desc: not available
Url : http://lists.puremagic.com/pipermail/greylist-users/attachments/20050531/090a26c3/smime.bin
More information about the Greylist-users