Comment 58 for bug 220014

I have the same bug, but the workaround does work because if I move the messages
in a new folder and then back, the message that I get back are those that were
displayed before (in the preview pane) not, those that were in the message list.

But the correct emails are those that are in the list, the shown emails are
duplicate of mails found elsewhere in my mailbox.

So after applying the workaround, all the incorrectly displayed emails are lost.

Also, do you use the "message filter" (not sure of the name) and more precisely,
do you have a rule which include the action "stop the processing" (not sure
either for the title). I believe that this may be related (but that is just an
hypothesis).