Re: [Asrg] How many legitimate SMTP servers?

["Alan DeKok" <aland@freeradius.org>]

"Ken Hirsch" <kenhirsch@myself.com> wrote:
> Does anybody have an idea of how many legitimate SMTP servers there are?
> That is SMTP servers that are not used primarily for spam, have a static IP
> address, and have been active in the last, say, 12 months.

  A number I heard from one spam filtering services was that they had
roughly 250K IP's maching those criteria.

  That's small enough to set up a DNS whitelist, doing the opposite of
what RBL's do.

  Alan DeKok.
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