User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3 GTB6 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.9) Gecko/20100317 Lightning/1.0b1 Thunderbird/3.0.4 Request that TB is to support the extended MAPI standard to allow to send a message via TB from third party application. E.g. a very simple Python script which would allow to send a message. session = False try: session = win32com.client.gencache.EnsureDispatch ("MAPI.Session") except: print 'Probably no extended MAPI client installed' raise return try: session.Logon("") newMsg = session.Outbox.Messages.Add(subject, message) if tos: for to in tos: newMsg.Recipients.Add(to[0], to[1], mapi.MAPI_TO) if ccs: for cc in ccs: newMsg.Recipients.Add(cc[0], cc[1], mapi.MAPI_CC) if bccs: for bcc in bccs: newMsg.Recipients.Add(bcc[0], bcc[1], mapi.MAPI_BCC) if attachments: for attachment in attachments: newMsg.Attachments.Add(attachment) newMsg.Send() session.DeliverNow() finally: if session: # Outlook really dislikes if session is not closed session.Logoff() https://bugzilla.mozilla.org/show_bug.cgi?id=128284 is similar but only talks about connecting to Exchange. Reproducible: Always

(In reply to comment #0) > > https://bugzilla.mozilla.org/show_bug.cgi?id=128284 is similar but only talks > about connecting to Exchange. In the end it's implementing the same thing.