Adam Hardy wrote:
[snip]
sorry if this is a dumb question, but your email implies spam-assassin
does DNS look-ups to filter out spam - which is not what I thought
after giving spam assassin the once-over check-out. Is it so? What
level of effectiveness does it have?
And can it actually filter your pop3 server's inbox before download?
I am using DNS and DCC checking here with spamassassin. Also with the
"rules du jour" additions which update blacklist files a couple of times
a week. The results after three months or so are 100% spam-catching and
no false positives, though I did start out with a well-trained bayes db.
The nice aspect of this is that I can now blackhole spam mail with a
score of more than, say, 15 without having to worry about losing genuine
mails.
However, this is just on a home set-up with +/- 400 mails a day, mostly
from mailing lists. Since each email has to be checked online, so to
speak, things do slow down and if traffic on the net is heavy it can
take up to around 5 seconds for SA to check each email. For only a few
emails, this doesn't matter but if you had thousands it would be very
hard, I imagine. Even so, this has provided the missing ingredient
that's turned spam filtering from "so-so" to very good.
I don't know the answer to your second question as I run exim4 as my own
mailserver, so everything gets downloaded before handing off to SA.
Doesn't sound very likely, though.
:)
Fish
--
To UNSUBSCRIBE, email to [EMAIL PROTECTED]
with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
