Define message-subject, -validity, -to, -cc, -bcc
Submitted by Will Thompson @wjt
Assigned to Telepathy bugs list
Description
Here's the HTML of a branch which defines a smattering of bonus headers: http://people.freedesktop.org/~wjt/telepathy-spec-message_headers/spec/Channel_Interface_Messages.html#Message_Header_Key
Bug 28740 firmly applies here.