What's with bogofilter and spam

[Anne Wilson]

On Thursday 04 June 2009 11:26:11 Rodd Clarkson wrote:
> On Thu, 2009-06-04 at 05:05 -0500, Mike Chambers wrote:
> > On Thu, 2009-06-04 at 20:01 +1000, Rodd Clarkson wrote:
> > > Recently bogofilter's spam sensing abilities seem to have gone all wrong
> > > in evolution.
> > > 
> > > I was getting way too much span in the inbox (maybe 10% of my spam
> > > wasn't getting detected) and even though I was highlighting it and
> > > marking it as spam the same sorts of messages kept appearing.
> > > 
> 
> <snip>
> 
> > > Are other noticing the same issues?
> > > 
> > > I prefer bogofilter over spamassassin as the latter takes forever to
> > > filter through email, especially when you've been on holidays for a week
> > > and have to pull a couple of 1000 messages.
> > 
> > Experienced everything you did, to include the marking my Fedora
> > messages as spam as well.  Just doesn't seem bogofilter and/or evo is
> > not working together like they did in F10.
> > 
> > I thought I was the only one experiencing this.
> 
> Filed as: https://bugzilla.redhat.com/show_bug.cgi?id=504112
> 
Spammers are getting a lot more clever/careful these days, using words that 
won't be detected.  I've found that I have to collect spam and 'unsure' ham 
into folders until I get a reasonable number, then every few days I run

bash /usr/share/bogofilter/contrib/contrib/trainbogo.sh -c -H /home/anne/Maildir/.INBOX.bogotrain_ham/cur/ -S /home/anne/Maildir/.INBOX.bogotrain_spam/cur/

(watch for line-wrap - it's all one line), repeating until the missed spam is 
down to about 3.  I then delete all the tested messages and collect the next 
batch.  I'm still seeing a number of unsures, but bogofilter is definitely 
learning the new stuff.

If you are seeing ham messages being detected as spam, copy a large number of 
similar messages, for instance mailing-list messages, into your ham testing 
folder before the run.  Doing this a few times should sort out any 
mis-training already there.  HTH

Anne
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