After giving up Seamonkey, I've taken my backed up data and installed Thunderbird. But the same problem is still there. I thought the greater Thunderbird popularity would be enough to prompt the community to fix this problem. I've alto tried to Google some possible solution and ended up in an interesting web page with some workarounds which did not work in my case, though: http://kb.mozillazine.org/Cannot_send_mail
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1215882 Title: Emails are silently discarded on 554 reply to STARTTLS To manage notifications about this bug go to: https://bugs.launchpad.net/thunderbird/+bug/1215882/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs