Richard Lamont wrote:
> I'm currently having fun trying out various anti-spam
techniques with my
> Postfix mail server.
Hows the anti-spamming going?
I've used the same approach for about a couple of years, and it works
well. I get about 100 spam attempts per hour. 99% are rejected by
Postfix using two checks:
(1) Does the FQDN in the EHLO resolve to the client IP, and does the
client IP reverse resolve to the same FQDN?
Of the 1% that gets through, over 90% is nailed as spam by the Bayesian
filter in Thunderbird.
So I get about 1 or 2 spams a day in my inbox, and about 20-ish in my
junk folder which I can peruse at leisure to spot the very occasional
false positive (about one a month).
As far as Bayesian filtering is concerned, I've never bothered with
spamassassin. The filter in Thunderbird works well enough, needs no
configuration, and offers an ideal user interface for picking up false
I also never bother with virus checking, as I have no Windows machines
and there's no risk of me sending viruses to anyone who does. It also
puts quite a heavy load on a mail server and slows things down. (My
server is an old 450 MHz beige box, which I like because it uses only 29
Watts of juice. Guess who pays the electricity bill here.) And Clamav,
good though it is, does seem to have a regular supply of security holes.
I'm now looking at other objective tests such as SPF and DKIM. I don't
expect these to do much about spam, but they may be of more help against
Richard Lamont http://www.lamont.me.uk/
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