[Bug 1074260]

[Irving]

Disabling download of MIME parts on demand may work around this issue -
could some of you try setting the advanced preference

mail.imap.mime_parts_on_demand

to false, restart Thunderbird, and see if the problem goes away?

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

Title:
  Thunderbird heavy IMAP traffic downloading messages

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