> 1) Spammers rarely use the same address for long
> 2) Spammers frequently spoof the address they are using so you would be
> blacklisting an innocent 3rd party.

When they spoof isn't the RFC822 fake, not the SMTP envelope?

Well behaved TMDAs look at SMTP info not RFC822, right?

> 3) Unless they confirm, they aren't going to get past TMDA anyway.

I think the goal is to reduce the # of challenge messages sent out

tom



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