On Mon, Mar 08, 2004 at 07:00:04PM -0600, the entity calling itself Christopher D. 
Lewis stated:

> The next question I suppose is ... since IM2000 appears dead (based on 
> list traffic) is there any alternative to create a system by which 
> senders could not send without ensuring that receivers knew the 
> identity of the responsible server?  This isn't pf, but a pointer to 
> the "right list" would be appreciated :-)

I'm not familiar with IM2000 at all, but what you describe sounds like 
"whitelisting" - a list of servers that are guaranteed not to send spam.

Jay

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