0.9.1 (13-09-2013)
0.9.1/1 added support for Sender header (content form)
0.9.1/2 added support for built in "Email User" feature
0.9.1/3 added support for SendGrid
0.9.1/4 added support for bounce processing (Mandrill only atm)
Screenshot of the notice for user with bounced email address: