Re: Research question: How many legitimate mail sources are out there?

>I could live with something like: my greylisting server whitelisted x
>IP addresses (I'm figure John Levine could give us this number quite
>quickly for his a "several hundred individual mailboxes, a few dozen
>mailing lists, and the abuse.net message forwarding system.")

It's about 22,000 addresses.  My fixed greylist covers about 3000 more
addresses in CIDR blocks, of which probably no more than a few hundred
send mail.

I have no idea how this relates to the pattern a larger ISP would see.

R's,
John