BMH is being re-released as PHPMailer-BMH and is designed for PHP5. Lots of new features, stable code, new rules. sourceforge.net/projects/bmh
Here is the very first release of BMH - BounceMailHandler, but it has been working in a production environment for a while.
The code version is 0.5. The last bounce rule no is 235.
Right now, in a real world, this release of BMH could correctly recognize 98.43% of bounce mail. Our target of next release is improve this ratio to 99%.