Milter-greylist

> Computers are cleverer than mere mortals, so let milter-greylist do that
> consistency checking for us.
> Milter-greylist should use max(specified_autowhite, timeout) as the
> autowhite value, put a warning message into the log, and continue.
> Add documentation which states that that's how it will be, and it's
> goof-proof (well, at least consistent in a way which won't unnecessarily
> loose mails).
> Phil

How about following behaviour? (autowhite=1d, timeout=5d)

1. Return 451 against an email at 0:00.
2. Accept the retried email at 0:20 and add the sender to
autowhitelist whose expiration date is 120:20.
3. Receive another email at 50:00. No change.
4. Receive another email at 110:00. The expiration date is postponed
to 134:00.