Log Message:
Update to 4.6.5. From the changelog:

- disable debug logging message which would show up in messages if
  --trace was used and the message was passed through an external
  filter. Thanks: Christian Bruemmer.

- add additional sanity checks to ensure a recent-enough Python is
  used; trying to run getmail 4 with Python 2.2 would throw an
  exception. Thanks: fakhri ?.