At 01:19 PM 1/9/97 -0800, Vadim Antonov wrote:

The solution is source address filtering at edges, to relieve attackers from the benefit of forged source addresses, and reverse lookup

Yet another application for draft-ferguson-ingress-filtering-01.txt. :-) - paul

authentication in MTAs -- just do not accept any mail coming from an invalid source address, or source address not corresponding to what is in Sender, Reply-To or From field.