P.S. As I mentioned above, I had been using the lazy ("localhost") courier cert for TLS authentication. Worth noting that even after switching to a self-signed cert for the correct server address, I have the same issue.
-- Problem with TLS support https://launchpad.net/bugs/23548 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs