Log Message:
Update to 4.30.1. From the changelog:

- silence a nuisance deprecation warning about the sets module when
  running with Python >= 2.5 which was reintroduced in 4.29.0.
  Thanks: Stephan Schulz.

- fix breakage introduced in 4.29.0 where BrokenUIDLPOP3Retriever
  would fail with a TypeError at logout time. Thanks: Scott Robbins,
  Stephan Schulz.
- fix breakage introduced in 4.29.0 where deleted mail was not being
  expunged from the last (or only) folder retrieved from in an IMAP
  session. Thanks: Paul Howarth.

- update old contact information for Free Software Foundation.
  Thanks: Ricky Zhou.
- fix incorrect character encoding in plaintext documentation.
  Thanks: Ricky Zhou.
- ensure getmail exits nonzero if a server refuses login due to a
  credential problem. Thanks: Stephan Schulz.

- ensure getmail exits nonzero if various error conditions (like
  POP/IMAP authentication failure) occur. Thanks: Ryan J., Stephan
  Schulz.
- python versions prior to 2.5.0 contain a bug when dealing with
  read-only IMAP mailboxes. Monkey-patch imaplib when running with
  Python<2.5.0. Thanks: Les Barstow.
- do IMAP modified-utf7 conversion of mailbox names containing
  non-ASCII characters. Thanks: A. Lapraitis, Randall Mason.
- add special ALL value for retrieving mail from all selectable
  IMAP mailboxes in the account.
- change IMAP retrieval strategy to retrieve all messages from a
  mailbox, then move on to the next mailbox, etc. Should result in
  increased speed, but if you set `max_messages_per_session` too
  low, this could result in later mailboxes not being retrieved
  from.

Updating this leaf package during the freeze for bugfixes.