This took the words right out of my own mouth. I agree 100%. But, it's very difficult to convince many email server admins (whom are known around here by the term "customer") of what John said so we don't do it in our mail server.
-- Arvel John C Klensin wrote:
Let me say this a little differently. The argument against supplying the spammers with information parallels the old security argument against revealing whether telling which of the user name or password
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