* :ref:`Attachments <sending-attachments>` are now supported
* :ref:`Mandrill templates <mandrill-templates>` are now supported
* A bcc address is now passed to Mandrill as bcc, rather than being lumped in
with the "to" recipients. Multiple bcc recipients will now raise an exception,
as Mandrill only allows one.
* Python 3 support (with Django 1.5)
* Exceptions should be more useful:
:exc:`djrill.NotSupportedByMandrillError` replaces generic ValueError;
:exc:`djrill.MandrillAPIError` replaces DjrillBackendHTTPError, and is now
derived from requests.HTTPError.
(New exceptions are backwards compatible with old ones for existing code.)