[Bug 1074260]

[Florian Effenberger]

I have the same issue, beginning with 16.0, now with 16.0.2. Dovecot 1.2
is the remote server, I can provide access to it if that is helpful.

If it helps, here's my report:

I'm configured for offline folders with a limit of 50 KB per message. It
seems that since TB 16.x, messages from several folders are reloaded
periodically, even if I hadn't opened them for weeks. Also, the status
line is wrong, e.g. it shows "Loading message 1 of 1 from Folder XYZ",
although in the folder there are e.g. 500 messages.

Compacting messages and repairing folders didn't help at all. What is
interesting, though, is that the problem seems to vanish for the current
session only, when I sync all messages, even if new messages arrive
after that. After a TB restart, the same problem occurs, until I sync
again.

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

Title:
  Thunderbird heavy IMAP traffic downloading messages

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