[kmail2] [Bug 358041] New: spamassassin filter deletes every incoming mail

[via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=358041

            Bug ID: 358041
           Summary: spamassassin filter deletes every incoming mail
           Product: kmail2
           Version: 5.1
          Platform: Ubuntu Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: critical
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: 1358 at gmx-topmail.de

>From time to time, the generated spamassassin filter rules deletes every
incoming mail.

The filter log says (localized in german. if you could provide me information
how to get the english output i'll post it):
[19:49:29] Filterung beginnt bei Nachricht „Re: xxx“ von „xxx “ um „Freitag,
15. Januar 2016 19:45:47 UTC+01:00“ :
[19:49:29] Filterregeln werden geprüft: (auf alle Nachrichten zutreffen)
"<size>" <greater> "0"
[19:49:29] Filterregeln wurden angewandt.
[19:49:29] Filteraktion anwenden: Durch Programm leiten "spamassassin -L"
[19:49:31] Filterregeln werden geprüft: (alle folgenden Bedingungen müssen
zutreffen) "X-Spam-Flag" <equals> "YES"
[19:49:31] 1 = "X-Spam-Flag" <equals> "YES" (YES)
[19:49:31] Filterregeln wurden angewandt.
[19:49:31] Filteraktion anwenden: In Ordner verschieben "Lokale
Ordner/Papierkorb"
[19:49:31] Filteraktion anwenden: Markieren als "Gelesen"

The problem: [19:49:31] 1 = "X-Spam-Flag" <equals> "YES" (YES)

However, *there is no X-Spam-Flag header the mail*. It seems as if the mail has
not been touched by spamassassin at all.

If I send the mail manually through spamassassin it is recognized as ham.

The problem started with KF5.

Reproducible: Sometimes

Steps to Reproduce:
receive emails. from time to time emails are apperently not processed by
spamassassin, but marked as spam.

Actual Results:  
the mail is marked as spam

Expected Results:  
processing by spamassassin and correct header-filter-result behaviour.

I've lost emails (and was asked why I did not respond), so I set the severity
to critical.

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