[Bug 1074260]

[Joris Le Blansch]

Hi all, having exactly these same symptomps against my Zarafa 6.4.x IMAP
server. Worked always well untill TB 16.x was installed as part of my
regular updates. To make sure I have no corrupted messages or so I have
been through the repair, compacting etc. but no luck. This afternoon I
deleted my local TB profile (after having placed my mail folders in a
local TB folder) then deleted my Zarafa mail account and all associated
from the server. Booted Zarafa server freshly and recreated my email
account (got a few calls in the mean time from people getting bounces
sending me mail since my mail account was really completely removed for
the sake of the test) and then recreated my TB profile. Reimported only
my inbox folder with some 1100 msgs and synched completely being
connected with eth in the office with LAN connection to server. During
the afternoon, saw the same behaviour again (ie. redownloading all msg)
and now being connected remotely over VPN it's even more obvious with
the slower connection. Let me know if I can provide more/better details
to help on this issue. It is quite a big issue, and as we update with
Ubuntu regular updates as they come out automatically it is starting to
hit other people in the office as well.

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https://bugs.launchpad.net/bugs/1074260

Title:
  Thunderbird heavy IMAP traffic downloading messages

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