[kmail2] [Bug 368501] New: Data loss and filtering problems when running KMail2 remotely

[Tristan Miller via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=368501

            Bug ID: 368501
           Summary: Data loss and filtering problems when running KMail2
                    remotely
           Product: kmail2
           Version: 4.14.10
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: critical
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: psychonaut at nothingisreal.com

I have KMail2 set to check mail from a local mbox in my /var/mail directory.  I
have filters set up in KMail2 that automatically sort this mail into various
local folders.  Everything works fine when running KMail2 locally.

However, when I first start KMail2 over an x2go or ssh connection, it fails to
filter the incoming mail in the mbox account.  Basically, any mail that was
already in the mbox account when I started KMail2 stays in the mbox account. 
(But while KMail2 is running, any mail that *subsequently* gets delivered into
the mbox account does get correctly filtered.)

If I select the mbox folder in KMail2 and try to manually move the new messages
to a new folder, or try to manually apply the message filters, then sometimes
this works and sometimes it doesn't.  When it doesn't work, the message I tried
to move/filter remains in the message list of the mbox folder.  Sometimes I
also get an error dialog that says "Invalid item retrieved".  If I quit KMail2,
then sometimes I get an error dialog that says "Unknown error".  When I restart
KMail2, sometimes the message appears in the folder I tried to move or filter
it into, but sometimes it's completely gone -- it's neither in the original
mbox folder nor in the folder that it should have been moved or filtered into.


Reproducible: Always

Steps to Reproduce:
1. Set up a local mbox account in KMail2, and some filters to process incoming
messages in that account.
2. Quit Kmail2.
3. Have a bunch of messages delivered into the local mbox (via sendmail,
fetchmail, etc.)
4. From a remote machine, use ssh or x2go to connect to the machine, and then
run KMail2.

Actual Results:  
5. KMail2 shows the new messages in the mbox account, but doesn't filter them.
6. Attempting to manually move or filter the messages sometimes results in an
"Invalid item retrieved" error dialog.  If this happens, then when closing
KMail2, I sometimes get an "Unknown error" error dialog, and when restarting
KMail2, the message I tried to move or filter is completely gone.

Expected Results:  
5. KMail2 should filter the new messages in the mbox acount.

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