[Pymilter] How to shut down milter properly (I'm sure this is a FAQ but can't find it)

[Chris Gonnerman]

How do you shut down a Python Milter gracefully?  I want a
chance to clean up.  I know it's a signals thing but I'm not even
sure how to know which of the threads to send the signal to.

Linux 2.4, Python 2.2, milter 0.6.5

Thanks in advance!

-- Chris.