User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:49.0) Gecko/20100101 Firefox/49.0 Build ID: 20160922113459 Steps to reproduce: I click Send with my addon active email@example.com Actual results: Nothing Expected results: The email should have been sent. I can see lots of change to the Message Compose in 45.4 but I'm running 49.0 beta. I didn't notice that changing.. Has version 49 broken my addon and if so, how can I find what did it?
This is probably a question to post on mozilla.dev.apps.thunderbird newsgroup
This sounds like a support problem or may be related to the add-on. If it's add-on related (which you can test by disabling the add-on), contact the add-on author. In general, TB can send e-mail, there is no doubt about that.