Tab-address completion on compose window, using the GData library.
Gdata library is available from https://live.gnome.org/libgdata/.
+ o Libravatar
+ Displays sender avatars from https://www.libravatar.org/, from own
+ sender's domain if enabled or even an automatically generated one.
+
o MailMbox
Handles mailboxes in Mbox format using the libEtPan! library. Mbox
files can be added to the folder tree and used like regular mailboxes.