[Mimedefang] Greylisting and getting MIMEdefang performance info

[Michael Glad]

I've hacked MIMEdefang to do greylisting. I.e I've written a
filter_recipient routine which does a

        return("TEMPFAIL", "Greylisted: please try again.");

for emails that are to be greylisted.

However, it seems that these email are not counted in performance
statistics as reported by md-mx-ctrl and watch-mimedefang.

Is there a way to fix/hack MD to do that? As we greylist most incoming
emails I currently cannot get valid performance info.

        -- Michael Glad, email: glad at daimi.au.dk
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