[kmail2] [Bug 351218] New: missing "in-reply-to" and "references" headers in some outgoing reply emails

[Andreas Knüpfer]

https://bugs.kde.org/show_bug.cgi?id=351218

            Bug ID: 351218
           Summary: missing "in-reply-to" and "references" headers in some
                    outgoing reply emails
           Product: kmail2
           Version: unspecified
          Platform: Kubuntu Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: knuepfer at arcor.de

When I reply to emails then sometimes (but not always) the "in-reply-to" and
"references" headers are missing. This leads to improper threading of mails in
the receivers email clients.

I found this in one of my email accounts that I manage in the same kmail
instance. There it happens frequently when I reply to emails but not always. It
is the same kmail instance in the same KDE session.

I did not see a certain pattern yet why it is correct in some cases but missing
in other cases. It seems to happen only in email threads with many recipients,
though.

The version is 4.14.6-0ubuntu1, this version was not selectable in the list of
versions above,


Reproducible: Always

Steps to Reproduce:
1. Reply to an email, by default I use BCC to self 
2. check message source if "in-reply-to" and "references" headers are there


Actual Results:  
Sometimes the "in-reply-to" and "references" headers are there, sometimes not

Expected Results:  
"in-reply-to" and "references" headers should always be there when the message
was a reply to another message

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