Milter-greylist

Hello, all.

May be useful to expand option "quiet" for override 
hard-coded string: "Greylisting in action bla-bla-bla..." 
like this

...
quiet Server is busy now, come back later. Sorry for 
inconvenience
...

P.S. May be useful to enhance power of milter-greylist by 
adding real-time sender address callback verification? I 
can provide my own realization this callback.

Kind regards,
Eugene Kurmanin
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