milter manager is a milter to use multiple milters effectively.
If milter manager is introduced, milter manager administrates milters instead of MTA. The has some advantages:
A bug fix release of 2.0.3
=== Ruby milter
==== Improvements
* Add Milter::Client::Test::MilterRunner
* Add Milter::Client::EnvelopeAddress
==== Fixes
* Fix the bug that milter written in Ruby cannot finish properly on multiple CPU environment
