http://dovecot.org/releases/1.1/dovecot-1.1.15.tar.gz http://dovecot.org/releases/1.1/dovecot-1.1.15.tar.gz.sig

The command pipelining fix is pretty interesting. Wonder how much it improves performance, especially when deleting lots of messages from a large mailbox.

v1.1.15 2009-05-17 Timo Sirainen <tss@iki.fi>

+ IMAP: When multiple commands are pipelined, try harder to combine
  their mailbox syncing together. For example with Maildir pipelining
  STORE 1:* +FLAGS \Deleted and EXPUNGE commands the files won't
  be unnecessarily rename()d before being unlink()ed.
- IMAP: SEARCH command was slower than necessary in a large mailbox.
- deliver: When forwarding messages, if -f parameter was given, it
  should have been used as the Return-Path.
- Maildir saving: Fixed race condition bugs in uidlist handling,
  causing files to be given new UIDs sometimes.
- mbox: Don't crash when expunging all messages and file doesn't end
  with [CR]LF.
- expire-tool: Use mail_uid and mail_gid settings if userdb doesn't
  return uid/gid.
- Berkeley DB dict: Transaction rollbacking was implemented wrong.
- zlib plugin: Some email / FETCH command combinations could have
  disconnected the client or sent compressed garbage.