So, the first broken nightly appears to be https://ftp.mozilla.org/pub/mozilla.org/thunderbird/nightly/2012/06/2012-06-20-03-02-01 -comm-central/thunderbird-16.0a1.en-US.linux-x86_64.tar.bz2
(https://ftp.mozilla.org/pub/mozilla.org/thunderbird/nightly/2012/06/2012-06-19-03-02-01 -comm-central/thunderbird-16.0a1.en-US.linux-x86_64.tar.bz2 works ok) I've also tracked it down to a specific message too. There seems to be 2 issues at play: 1) That the message is saved offline at all, as it is larger than the 50kB limit 2) When it is downloaded it never seems to get marked as available offline, so it is downloaded repeatedly every time the folder is updated (and ends up in the mbox file multiple times) -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to thunderbird in Ubuntu. https://bugs.launchpad.net/bugs/1068921 Title: Mailbox grows endlessly, heavy traffic Status in Mozilla Thunderbird Mail and News: In Progress Status in “thunderbird” package in Ubuntu: Confirmed Bug description: Yesterday I noticed that my Internet connection keeps transferring a lot of data. After a while I checked with nethogs and discovered this was caused by Thunderbird. Today I got a warning that my HDD was near full. In this 2 days, the mailbox had grown to 20 GB, while in reality it should be around 1 GB (a fresh zipped backup has 600 MB). I removed the .thunderbird folder and configured my IMAP mailbox from scratch. The same happened again. I think this is not related to a somehow special configuration of my PC bcs my colleague discovered it's the same on his machine. Without checking, he wouldn't have noticed yet bcs of a much bigger HDD... We couldn't yet find out what exactly happens / which data is transferred again and again. I suspect it's related to the last thunderbird update. Ubuntu 12.04 Tunderbird 16.0.1+build1-0ubuntu0.12.04.1 To manage notifications about this bug go to: https://bugs.launchpad.net/thunderbird/+bug/1068921/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp