Spam and sieve vacation
Tomas Lindroos DC
skitta at abo.fi
Tue Aug 28 10:14:25 EDT 2007
On Mon, 27 Aug 2007, Janne Peltonen wrote:
> 5/week? Whee. We might achieve something remotely approaching that with
> personalized bayesian filtering (a multi-discipline, internationaly
> connected university receives quite a lot of ham that looks very much
> like spam, so we are a bit paranoid about false positives).
Due to spam levels we have been disallowing "vacation" the last 4-5 years.
This summer we made it possible for our users to enable an autoresponder.
We use greylisting and spamassassin with bayesian filtering, and we are
quite low on spam ending up in users inboxes, and also on false positives.
We don't provide vacation via sieve though, we considered it not being the
IMAP server that should send the answers. Instead we use a home-grown
python script on a smtp server.
Since may 73 people have actually used this service. During the last 12
weeks 17129 messages were not answered, of which 3002 had a spam level of
3 or more and 1103 messages would have been answered if they had come from
inside addresses (our users can choose to answer only inside our domain).
2570 auto-replies were sent. Looking at the logs it seems that perhaps 25%
of these replies should not have been sent and most of these can actually
be caught with some more filters in the python script. That makes 200
backscatter messages a week for us this summer - probably worth it, and
the filters can be improved.
checking out rfc3834 right now - we seem to be fairly
Tomas 'Skitta' Lindroos.
UNIX systems administrator, Åbo Akademi University, Computing Centre
skitta at abo.fi, +358-40-5177716
More information about the Info-cyrus