[bogofilter] using block_on_subnets

[Tom Allison]

Bill McClain wrote:
> I rebuilt my wordlist recently and turned on "block_on_subnets=yes". I
> don't know why I hadn't done it before -- the technique is pretty
> valuable. Looking just at the top-level domains (url:nnn), about 60%
> occur only in spam. But: some of the tokens have a low message count,
> lessening their presumed value.
> 

Just for grins, I rebuilt my wordlist using this subnets option enabled.
My current database is about 50% larger than it was previously.

It will be interesting to see how it grows in the coming week.