[Bug 1068921] [NEW] Mailbox grows endlessly, heavy traffic

[didi_X8]

Public bug reported:

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

** Affects: thunderbird (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1068921

Title:
  Mailbox grows endlessly, heavy traffic

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