Greylisting seems to be the most effective way of eliminating unwanted
email. The problem is that it also has the potential to eliminate a
legitimate email. Couldn't a feature be added to greylisting software
that dispatches an email to the sender of any email that is
temporarily rejected and doesn't retry within a certain amount of
time? The email could say something like, "Your message of {date} was
rejected as possible spam. Please call us at {phone_number}."
- Grant
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