Log Message:
Update sylpheed to 0.9.2, from email on sylpheed list:

(Note: this includes the fix of a serious bug, so I'll recommend upgrading
       for 0.9.0 and 0.9.1 users (the older version doesn't have the bug).)

Changes:

    * The bug that removed messages from server if "Don't receive"
      action is specified by the filter rule has been fixed.
    * The bug that caused abort when a button is double-clicked on some
      dialogs has been fixed.
    * A warning that was displayed when address book was empty has been
      fixed.