Yodel! David, have you thought about letting postgrey work with exim4? Apparently, it's not very difficult, somebody has written a patch (haven't looked at it though, and won't include it in the Debian package if you don't include it in original postgrey.)
See the Debian bug report at <http://bugs.debian.org/377517> cheers -- vbi -- Today is Setting Orange, the 44th day of Confusion in the YOLD 3172
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