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.