OT - Mailing List Admin question

Norbert Hartl norbert at hartl.name
Sat Nov 10 12:50:47 UTC 2007

On Sat, 2007-11-10 at 13:38 +0100, Hans-Martin Mosner wrote:
> Norbert Hartl schrieb:
> >
> > In my experience the most effective spam prevention is to use
> > greylisting [1]. 
> Yes that's pretty good, too. Since some spammers have adapted to
> greylisting I have been using different greylist times depending on the
> reverse DNS of the sender IP. If it is unknown or looks like a dynamic
> address, the time is one hour, otherwise 5 minutes. That works pretty well.
> > Next is text heuristics. I have some email addresses
> > which are older than 12 years and I think it's assured they are
> > one any avalaible email list. 
> Text heuristics are ok for individual mailboxes, but for a mail server
> operator there can be legal problems if mail bodies are inspected.
> Of course, a mailing list operator might employ any filter heuristics
> he/she deems ok.
(Just a quick note. I don't think we should extend the topic on this

It depends. You can do everything with incoming mail as long as your
customers agree to it. We deliver detected spam to a specific folder.
There are two additional folders for the users to notify the system
about "false positives" and "false negatives". So the system can "learn"
what is considered as spam. 


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