[kmail2] [Bug 323980] New: Duplicate messages if antispam filter enabled

[NSLW]

https://bugs.kde.org/show_bug.cgi?id=323980

            Bug ID: 323980
           Summary: Duplicate messages if antispam filter enabled
    Classification: Unclassified
           Product: kmail2
           Version: 4.10.5
          Platform: Fedora RPMs
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: lukasz.wojnilowicz at gmail.com

If I enable antispam filter (SpamAssassin or SpamBayes) I recive more than once
every incoming e-mail.
It happens with IMAP account on Polish e-mail provider www.onet.pl. It doesn't
happen with GMail. It has been observed for "auto checking for new e-mails"
functionality.
The problem doesn't exist if antispam filter is disabled.


Reproducible: Sometimes

Steps to Reproduce:
1. set up an mail account on www.onet.pl (free of charge)
2. configure above account with kmail (IMAP way)
3. set up antispam filter
4. send e-mail to yourself
5. check for new e-mails on kmail
Actual Results:  
Identical messages are proliferating in my kmail mailbox and thus on mail
server. They've got the same incoming date and titles.

Expected Results:  
One message on mail server. One message in my kmail mailbox.

I suspect, it can be encoding that an provider uses, i.e.
Onet uses:
Content-Type: text/plain; charset="ISO-8859-1"
GMail uses:
Content-Type: text/html; charset=UTF-8

Above are from message source.

Maybe some Kmail routine have problems to compare e-mails on server with
e-mails that I already received and sends me something that I already have.

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