Bug 726746 - Allow to auto-empty trash without needing to exit
Bug 730743 - Add an option to disable sender's photo search at gravatar.com
Bug 730110 - Search results include also last email looked at
Bug 729905 - [external-editor] Mark composer changed after message body set
Bug 729963 - Include SIP, IM and TEL while merging contacts + Allow to select GivenName, FN
Bug 729667 - Create Folder window is much too short
Bug 729519 - [Composer] Do not show 'Untitled Message' in Discard question
Bug 729303 - Default width of Message Filters window is too small
Bug 731082 - Send mail in offline mode should use Outbox folder
Add "Send messages through Outbox folder" option

Users ask from time to time for the old behaviour when the messages
used to be saved through Outbox, rather than the composer being opened
all the time the message is sending. The change is pretty simple,
thus why not to add it.

Note the Outbox is not flushed after sending, the users is responsible
to invoke the Outbox flush on his/her own. This also allows a user
to postpone the message send for later.
Bug 604346 - Ctrl+Enter sends mail without asking confirmation