Spam blocking with greylisting
Posted Jun 27, 2003 15:07 UTC (Fri) by
copsewood (subscriber, #199)
Parent article:
Spam blocking with greylisting
I don't know how well this approach will work, at the moment it's at the
same status Bayesian filtering had a couple of years ago.
This is a very, very fast moving target, so research of this kind
is very welcome.
As I didn't have control over the MTA receiving mail for
my domain which I subsequently pick up using POP3, I developed a program
which tags spams using the DNS blacklists at a later stage.
I found my tagspam program on its own can catch about 80%. So I
combined this approach with SpamAssassin as 80% wasn't good
enough. However, the ones that get through tagspam mostly
get caught by SpamAssassin, which on its own also gets about
80%. Fortunately the combination of tagspam and SpamAssassin
seems currently to be getting about 98% (49 out of 50) which
I consider to be fairly good.
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