[kmail2] [Bug 411728] New: Messageid is leaking hostname

[sedrubal]

https://bugs.kde.org/show_bug.cgi?id=411728

            Bug ID: 411728
           Summary: Messageid is leaking hostname
           Product: kmail2
           Version: 5.11.2
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: kde at sedrubal.de
  Target Milestone: ---

SUMMARY
kmail generates message IDs using a random string and @<hostname>. There may be
cases where you don't want to tell your hostname.

STEPS TO REPRODUCE
1. Write an E-Mail
2. Send it
3. Inspect its sources

OBSERVED RESULT

The Message-ID is something like <$random@$hostname>

EXPECTED RESULT

There should be at least an option to make the message id anonymous.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 30
KDE Plasma Version: 5.15.5
KDE Frameworks Version: 5.59.0
Qt Version: 5.12.4

ADDITIONAL INFORMATION
Additionally it would be great to hide the following headers:
- X-KMail-Identity
- X-KMail-Transport
- X-KMail-Fcc
- X-KMail-Identity-Name
- X-KMail-Transport-Name

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