Alan explained,
> The concept is based on the premise that a normail mail server, on
> receipt of a temporary failure, will try again whereas a spam
> generator has no such sophistication and is a "send and forget"
> program. So if you fail, temporarily, every message the first time
> you see it, and accept each message the second time you see it, the
> process will cut out a lot of spam.
Then that raises two questions:
1. How soon will the other server retry? That can seriously delay
time-sensitive email.
2. Will it work for procmail to generate a temporary failure after the
smtpd has accepted the message? Doesn't the temporary failure have to
be reported during the SMTP transaction?
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