[mms] Fix intermittent error when purging messages using a Horde_Cache caching backend (Bug #12827).
[mms] Fix handling servers that don't support ESMTP (Bug #12853).
Released Horde_Imap_Client-2.16.1
Development mode for Horde_Imap_Client-2.16.2
Released Horde_Smtp-1.3.1
Development mode for Horde_Smtp-1.3.2