[kmail2] [Bug 375149] Kmail deletes emails from folder after switching to folder

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https://bugs.kde.org/show_bug.cgi?id=375149

--- Comment #6 from whatifgodwasoneofus at hotmail.com ---
(In reply to Robby Engelmann from comment #5)

I have the same issue and I also think it's related to the mail filter agent,
as ALL of my "disappearing" e-mails always go into at least one of the folders
which are the target folders for filter rules.

I have noticed that, when this occurs, the following happens:
1. I (manually) move one big message (e.g., with attachments of 10 MB in size)
from the source IMAP folder to a "local" folder;
2. KMail and/or Akonadi freeze, I can't say which one is hanging, but nothing
moves on any more;
3. I restart Akonadi (with or without killing KMail, it makes no difference);
4. When I re-open KMail and I click on a folder, messages from that folder
start to disappear (I can later find out where they go). I mean, I really see
messages disappearing "live" from the list of messages;
5. I click on another folder, and now the messages from THAT folder (the one
just clicked) start to disappear;
6. I shutdown KMail and Akonadi, restart Akonadi and KMail, and everything is
"calm".

I can find out where the messages have gone because I keep a backup of my local
mail folders (which are all "Maildir" folders) and I can DIFF against the
backup copy, so I can see which messages disappeared from one directory and
went into another, and can move them back to the respective ones.

I wonder what could happen if one of the mail filter rules is to DELETE
messages instead of moving them into another folder...

Please help!

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