> The second problem is that it still forces the originating SMTP server
> to pass on the 5xx error as a bounce message to the originator.
Yeah, I guess this would be a problem in cases where the originating
server is an open relay that's being exploited by a spammer. I wonder
what proportion of spam is sent in this manner -- and and how much, on
the other hand, comes from a direct SMTP conversation between a
malicious client and the MX server of the recipient's domain.
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