Log Message:
Update to 3.1.7, provided by Toru TAKAMIZU in PR 22007.
  -getmail_mbox.py was missing an import for the string module.
  Thanks to Emily Jackson for the report.  This was introduced in
  3.1.6.

  -Argh; my change to getmail_mbox was incomplete -- not only would
  getmail not put duplicate From_ lines in, it would escape the
  single one that it did.  This fixes it, so don't bother filing
  a bug report about this one.

  -Fredrik Steen reported that getmail was adding a duplicate From_
  line when using getmail_mbox to deliver to mbox files.  Fixed.
  -Added -q and --quiet flags to getmail_mbox to suppress warning
  message.

  -removed the experimental message_filter code; it was unworkable.
  If you want to filter messages, use a filtering MDA.  getmail
  works fine with maildrop, procmail, and other MDAs.  Thanks to
  Dan Hensley for experimenting with the message_filter functionality.

  -message logging inconsistently used local time; changed to GMT
  for consistency.  Thanks to Markus Vetter for the report.

  -address_no_brackets couldn't handle empty strings.  Fixed; thanks
  to Fredrik Steen for the report.