From: Simon Waters (no email)
Date: Wed Jun 01 2005 - 06:27:08 EDT
Just a note to thank Wietse and others for support (and patience) over the
last few weeks.
One of the domains we host (for bizarre historical reasons) receives pure
spam. From this we can estimate the effectiveness of the antispam measures
introduced by volume of email for this specific domain.
In the specific case of this dummy domain in moving from a vanilla sendmail
install with no antispam measures apart from some arbitary access lists
(created to prevent the server being wiped out by spambots) to using Postfix
with sbl-xbl and Postgrey, we see the (average) number of delivered email
(spam for this domain) reduced from 12848/day to 130/day.
i.e. The combination of Postfix/Postgrey/sbl-xbl stops almost exactly 99% of
the spam we were seeing against this domain.
Detecting false positives is harder, but so far we've had no complaints, and
no evidence of false positives has come to light via other means.
So far there is no evidence that the greylisting is becoming less effective
with time, which was one of my concerns (minor concern - the obvious solution
involves using "rm" regularly).
The only downside seem to be that this isn't the email server that handles my
email.
The only issue to come to light since going live was the need to increase the
maximum number of connections to the Postgresql database with the virtual
user tables in (primarily to deal with the backlog of emails that built up in
the transition between old and new servers).
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