I didn't get bogofilter install, due too some obscure library
incompatibilities, but
I've just installed
spamprobe
(
http://sourceforge.net/projects/spamprobe/)
which is another Bayesian spam filter.
Requirements: BerkeleyDB v3+. The application is written in c++.
After I installed and compiled the actual BerkeleyDB, spamprobe compiled and
runs under SuSE Linux 7.0 (2.2.16 Kernel).
On a base of 1000-2000 good/bad messages, it delivers astonishing 0 (zero)
false positives and less than 1.5% false negatives (i.e. undetected SPAMs)
in test on the base data.
spamprobe works as a filter, generally communicating via Header fields.
It reads the spam message from STDIN or a filename as argument and returns
string output, typically "GOOD <factor> <check-sum>" or "SPAM <factor>
<check-sum>"
which can be captured by the calling process.
I also tested
Bayespam
(
http://sourceforge.net/projects/bayespam/)
Bayespam is a perl-script. It requires MIME::Parser and DB_File. Bayespam
had a false positive / false negative ratio of 2,5 to 3% in _my_ data.
I chose spamprobe for several reasons:
1. spamprobe appeared to be faster
2. spamprobe performed better on my data sample
3. spamprobe accepts mbox as well as maildir format,
4. spamprobe is relative comfortable in maintenance an use:
- is self-learning
- can combine personal and group dictionaries
- has several command line tuning options
- fair diagnostic utilities
- good documentation
I, for my part use it only indirectly via procmail and put a spam-filter
into the mail clients.
# procmail reciept:
:0
SCORE=| /usr/local/bin/spamprobe -8 -c -D /dir/to/group/dict/ receive
:0 wf
| formail -I "X-SpamProbe: $SCORE"
This might be neither elegant nor fast but it works.
<disclaimer>
I am no ISP. I have only a few hundred emails a day to process.
</disclaimer>
> -----Original Message-----
> From: exim-users-admin@??? [mailto:exim-users-admin@exim.org]On
> Behalf Of Dennis Davis
> Sent: Monday, November 18, 2002 3:36 PM
> To: exim-users@???
> Subject: [Exim] Re: Spam Assassin vs. Bogofilter
>
>
> >I am looking into integrating a spam filter with Exim. I was
> >mainly looking at Spam Assassin,
>
> Existing techniques for this are usually combined with virus
> scanning. I know of the following that can be used with exim. All
> combine virus scanning with spam detection. I suspect (3) may be
> the only approach that can just run spam detection.
>
> (1) amavisd-new, available from:
>
> http://www.ijs.si/software/amavisd/
>
> (The amavis project is based at:
>
> http://www.amavis.org/
>
> and is just concerned with virus detection.)
>
> (2) MailScanner from:
>
> http://www.sng.ecs.soton.ac.uk/mailscanner/
>
> (3) Tom Kistner's exiscan from:
>
> http://duncanthrax.net/exiscan/
>
> Of the above I expect that MailScanner will make the most efficient
> use of CPU power etc.
>
> Tom Kistner's exiscan uses exim4's local_scan facility and can
> reject suspect email during the SMTP transacation. I personally
> like this approach; it gets rid of suspect mail at the earliest
> opportunity. Note it rejects the suspect email while the SMTP
> connection is still open. Thus the sending MTA is responsible for
> generating the error message. The receiving MTA won't have to care
> if the envelope sender is forged -- this happens a lot with viruses
> sent by email -- and so run the risk of sending a virus warning
> message to the wrong person.
>
> > but a colleague gave me a magazine article which mentioned
> >Bogofilter (http://www.tuxedo.org/~esr/bogofilter/). I was
> >wondering if anybody on the list has used or tried this software
> >with Exim. If so, do you know how well it compares with others,
>
> Bogofilter is bayesian mail filtering software. For further
> information you might like to look at Paul Graham's article:
>
> http://www.paulgraham.com/spam.html
>
> Other bayesian mail filtering software can be found at:
>
> http://sourceforge.net/projects/bmf
>
> I've certainly not used bmf. However there is a port of this
> software in the latest OpenBSD ports tree. And I've seen comments
> from one OpenBSD user that he's happy with using bmf. As usual,
> your mileage may vary...
>
> --
>
> ## List details at
> http://www.exim.org/mailman/listinfo/exim-users Exim details
> at http://www.exim.org/ ##
>
>
