> FB> hm, if ASSP is running behind an other server or proxy, we have good
> FB> control and knowledge about the border-ip. 
> Yes, but than we have to prevent any other server from sending (by
> checking the IP or using a Firewall)
> 
> Best would be to test the all but the first recieved-header IPs. (The
> first is often a dialup or local IP)
> MX-guard does this and found some spam with this method.
> 

already tried. No real benefit. But a lot of danger there.

almost all dnsbl have suppose you check only the connecting host.

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