Hi Ged.
I'm just replying to one of your queries, as the answer is quite
simple...
> Finally I'd like to know why the DOSEMU list filters don't stop
> something that Riley's filter does. I'd have thought that anyone
> running a mailing list ought to have a better filter than any of
> us punters out here who are just using it.
First of all, it's not the DOSEMU filters that cut out the spam, as
there aren't any. It's the vger.kernel.org filters that cut out the
spam - and they do so across ALL of the mailing lists housed there.
That directly leads to the reason why the are UNABLE to use filters
like some of the ones I use - the system can't afford the delays it
would involve to do so because of the load it is already under.
Here are TWO of the filters I use:
1. EVERY email received on my system gets its senders host fed
into a DNS lookup. If the lookup fails, that email is treated
as spam and deleted on the spot.
2. Every email received on my system gets its "Received:" headers
analysed, and EVERY host listed in a Received: header is fed
into a DNS lookup. If it fails, it's assumed to be probable
spam. However, depending on content-rules that I also run, it
may be deleted or filed in a probable-spam folder for review.
On a typical post through vger.kernel.org the above produces from
four to nine DNS lookups. With the volume of mail passing through
vger.kernel.org each day, that would add far too much overhead to
the processing time simply because of the network overhead caused
by EACH of those DNS lookups.
Best wishes from Riley.
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