[kmail2] [Bug 431860] New: Problem moving bulk emails

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https://bugs.kde.org/show_bug.cgi?id=431860

            Bug ID: 431860
           Summary: Problem moving bulk emails
           Product: kmail2
           Version: 5.13.3
          Platform: Ubuntu Packages
                OS: Linux
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: commands and actions
          Assignee: kdepim-bugs at kde.org
          Reporter: jeremy at shorehub.com
  Target Milestone: ---

SUMMARY
Ran the kmail expire function on a folder to move all emails in a courier-imap
folder older than 1095 day (3 Years) to another folder "OLD".



OBSERVED RESULT
I now have thousands of emails listed both in my Inbox and "OLD" folders as:

Subject: "message unavailable"
Sender: "System Administrator root at localhost"
Date: 1/1/70 12:00 AM

Inbox Folder Properties -> Maintenance now shows 
Total Items: 5609
Unread Items: 17

OLD Folder Properties -> Maintenance now shows 
Total Items: 13064
Unread Items: 13058

Logging into my courier-imap server,
listing files in inbox/cur shows:
$>ls -l cur|wc -l
  5612

listing files in OLD/cur shows: 
$>ls -l .OLD/cur|wc -l 
  13065


Roundcube now shows 4663 Inbox emails and they're all visible
Also now shows total of 13064 all unreadable but for 2.
All the moved emails now show in "OLD" folder as:
Sender: "System Administrator root at localhost"
Subject: "message unavailable" 
Date: 1/1/70 12:00 AM


So apparently messages were lost.
Logging in to the imap server and looking at a an email:

$ .maildir/.OLD/cur # cat
1611159631.M331669P27922V000000000000FD07I0000000000126AC5_6563.apps\,S\=414\:2\, 
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on jaj.acjlaw.net
X-Spam-Level: ****
X-Spam-Status: No, score=4.2 required=5.0 tests=MISSING_DATE,MISSING_HEADERS,
        MISSING_MID,NO_HEADERS_MESSAGE,NO_RECEIVED,NO_RELAYS autolearn=no
        autolearn_force=no version=3.4.4
X-Virus-Flag: no
From: System Administrator <root at localhost>
Subject: message unavailable

This message is no longer available on the server.
apps /home/anita/.maildir/.OLD/cur


EXPECTED RESULT
should show correct number of emails now in both my "Inbox" and "OLD" folders
and should also display the subject, sender, and date correctly. 
I can't see any of my moved emails using kmail even though they are clearly
there in the courier-imap folder on the server. 

I've deleted the courier-imap account in kmail and re-added the account to no
avail. All my emails are now "gone" but they're there on the server. They were
indeed properly moved from "Inbox" to ".OLD/cur" 

I've also run "akonadictl fsck" and "akonadictl vacuum" to no avail. 

SOFTWARE/OS VERSIONS
Ubuntu: 
# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 20.04.1 LTS
Release:        20.04
Codename:       focal


Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION
Will restore from backup and try another program to move old emails.

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