The problem has to do, as mentioned, with emailproviders. My provider has switched server from Courier to Dovecot (which is better (he told) in modern technology), and Thunderbird is now back as normal.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1477987 Title: Thunderbird 1:31.8.0+build1-0ubuntu0.15.04.1 never asks for account password To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1477987/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs