On Wed, 7 May 2008, Aaron Wolfe wrote:
If you just want IPs, maybe instead of running an SMTP service that 450s, you would want to use a packet filter like iptables instead. You could get the IPs simply by what packets you saw come in to port 25 and noone would have to worry you were stealing their mail.
(1) Mark is trying to collect data on how the remote MTA behaves when presented with a 451 tmpfail result. A firewall rule can't do that.
(2) If someone doesn't trust him when he says "I won't accept or read your mail", why will they trust him if he says "I have it firewalled off"?
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