I'm seeing this too. These look very much like related bugs:
https://bugzilla.mozilla.org/show_bug.cgi?id=803843 https://bugzilla.mozilla.org/show_bug.cgi?id=802217 ** Bug watch added: Mozilla Bugzilla #803843 https://bugzilla.mozilla.org/show_bug.cgi?id=803843 ** Bug watch added: Mozilla Bugzilla #802217 https://bugzilla.mozilla.org/show_bug.cgi?id=802217 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1068921 Title: Mailbox grows endlessly, heavy traffic To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1068921/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
