[kmail2] [Bug 335820] New: Unable to move mails from an imported folder to another one: Unable to retrieve item from resource: Invalid item retrieved

[René Krell]

https://bugs.kde.org/show_bug.cgi?id=335820

            Bug ID: 335820
           Summary: Unable to move mails from an imported folder to
                    another one: Unable to retrieve item from resource:
                    Invalid item retrieved
    Classification: Unclassified
           Product: kmail2
           Version: 4.13.1
          Platform: openSUSE RPMs
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: folders
          Assignee: kdepim-bugs at kde.org
          Reporter: renda.krell at gmail.com

I have a Local Folders resource in Akonadi used in KMail. Akonadi runs in a
separate MySQL/MariaDB database.

After importing thousands of mails from Thunderbird I tried to reorganize them
a bit.
Unfortunately, I'm unable to move a lot mails (not all) from an the imported
folders to another one create new in KMail. It fails with a messagebox: "Unable
to retrieve item from resource: Invalid item retrieved". From the user's point
of view, I cannot recognize any problem with the original mail to move, no
broken header, all intact.

After some search, I'm able to find single mails which break this move action,
but I don't know what is so special about them compared against the mails I
moved successfully. Maybe one of you guys can give me a hint what else
information could be useful for analyzing this.

Reproducible: Sometimes

Steps to Reproduce:
1. Import a folder structure from Thunderbird (I had 10000 or more mails there)
2. Create another target folder structure in KMail under Local Folders
3. Move mails in several folders to the newly created folders
Actual Results:  
"Unable to retrieve item from resource: Invalid item retrieved" during moving
several mails in several folders

Expected Results:  
Moving should succeed.

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