[bogofilter] using block_on_subnets

[Tom Anderson]

From: "Richard Kimber" <rkimber at ntlworld.com>
> Are you looking up the ASN from an external site each time? Or do you
> hold an ASN database locally and update it with cron?

External server.  Maybe in the future I'd consider keeping a local copy, but
for now I'm sticking to simplicity, and the lookups are fast anyway.  In the
source, look for:

# server to use for ASN lookups
our $asn_server = "asn.routeviews.org";

Tom