[Akonadi] [Bug 283682] KMail duplicates filtered messages

[Tobias Leupold]

https://bugs.kde.org/show_bug.cgi?id=283682

--- Comment #122 from Tobias Leupold <tobias.leupold at web.de> ---
András, I'll have a look at the sources, but I fear the KMail/Akonadi codebase
is a bit too hard for me (I have not been into the C++/Qt business very long
yet ;-). But I'll try.

Another thing to substantiate the suspicion that the duplication does not
happen when the mails are filtered but when they are delivered:

Yesterday, I saw that the default setting for filtering when selecting "Filter
incoming messages" is that all "Accounts" are used for filtering. This includes
not only the POP3 accounts (which are actual ones), but also the local maildir
"Accounts".

I selected only my POP3 account and deselected everything else. I also
deactivated my "/usr/bin/sleep 0.3" hack filter. After that, I ended up with
filtered mails being written to their respective target directory and a
(physical!) copy of those very mails being written to my inbox.

So it's actually the case that the emails are simply delivered twice, one by
the filter agent and one by the, (?) pop3 agent, and the duplicating really
happens because the inbox notifies new mails and the filter agent is invoked
again.

Perhaps, this is "only" a sequence problem and the  filter agent is invoked too
early?! Can anybody who's into the code base right now check that? Otherwise, I
fear we have a design problem here :-(

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