followup from bug 490234, comment #7 and comment #8 It would be good to investigate which is the right port: autoconfig uses port 465 for smtp.googlemail.com, whereas google help recommends to use port 587 (even though I'm not sure if that is recent information): http://mail.google.com/support/bin/answer.py?hl=de&answer=77662

It seems like smtp.googlemail.com supports TLS and SSL. You just have to pick the right port. Currently TB defaults TLS to port 25 TB defaults SSL to port 465 If server = smtp.googlemail.com 587 - TLS => Works 465 - SSL => Works No other combinations work. port 25 also doesn't support anything.

The current config is to use SSL, on the SSL ports: <http://ispdb.mozillamessaging.com/details/10> That's consistent and logical for me. I just talked to a big ISP today, and they said they prefer SSL on the SSL ports instead of STARTTLS on the normal ports. So, WONTFIX. I don't think it matters much, anyways.