Vivek Khera said:

> Is such age-weighting done for the spam corpus as a whole?  It seems
> to me that some older spam signatures are being phased out and may not
> be relevent for current spam... but then maybe I'm wrong about that.

Yep, in a more blunt-instrument way; we just try to use the last 6 months'
mail for testing (roughly).

I took a look at some old spam recently and it was amazing how different
it was.  Also, about 20-30% of all spam nowadays seems to be relayed
through open proxies, so tactics have changed quite a lot.

--j.


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