On Mon, Jan 07, 2002 at 06:50:26PM -0800, Professional Software Engineering
wrote:
Alternatley, you can take all the mail you have saved in mailboxes and just
throw it at a sandbox recipe that logs such matches and delivers everything
to /dev/null. Then, you can test it against your saved mail and evaluate
it for yourself.
I checked about 9GB of mail spool, consisting of about 7500 or so users.
Most of this mail spool was collected prior to the installation of the
rigorous spam filters that are now in place.
I found that about 1 in every 30000 messages contained upper case
headers. Of the 150 or so that I glanced at, every one was an advert
for bulk email services, inkjet supplies, work from home, financial
services, or an MLM scheme.
I think it's a safe bet that the false positive rate from blocking upper
case headers will be incredibly small. Good enough for me, anyway.
The server in question has alot of old accounts which these days receive
very little legitimate mail and are basically spamtraps. Interestingly,
in the past 24 hours that I've been running my new spam filter on this
box, it has processed over 14000 inbound emails, out of which I've
caught just over 4300 pieces of spam. And of those I believe only three
of 'em were false positives, caused by an error in one of the recipes!
I'm pleased!
But I'd also like feedback. All and sundry are welcome to peer at
http://www.it.ca/software/procmail-spamtrap and lambaste me for failing
to using scoring. ;-)
--
Paul Chvostek
<paul(_at_)it(_dot_)ca>
Operations / Development / Abuse / Whatever vox: +1 416 598-0000
it.canada http://www.it.ca/
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