On Donnerstag, 7. Juni 2007 Tom Allison wrote:
> If you want to make dbmail capable of doing spam filtering...
>  wouldn't it make more sense to simply pipe the spam filtering in
> front of the dbmail interface like procmail does today?  I'm stuck on
> this one.  I don't know where there is much advantage here.

It should never *do* spam filtering, but *support* it. The idea is this:
- there are distributed checksums like DCC, pyzor, razor
- they are reported by thousands of mailservers, which calculate 
checksums on every e-mail they receive
- once a certain checksum gets a lot of hits, the probability that it's 
spam increases
- the disadvantage is, that if you're the first who gets hit by a new 
spam wave, no checksums will exist
- so if you can, by the end of the day for example, later reprocess 
those e-mails with a high probability of being spam, and filter them, 
your system works better
- this is especially true for Sunday night, you can reprocess those 
spams that arrived during the weekend, so people on monday morning will 
have even less spam than before

It could well be that soon e-mails with pictures will be delayed by an 
hour or so before giving them to the users, just to recheck them for 
spam checksums later. It sounds strange now, but when spam rates grow, 
things have to be done. Another option would be to reject e-mails 
containing inline pictures that are highly probable spam, and only 
allow attached pictures.

mfg zmi
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