[kmail2] [Bug 387619] New: Some of Mailsploit test patterns are incorrectly decoded

[Shinjo Park]

https://bugs.kde.org/show_bug.cgi?id=387619

            Bug ID: 387619
           Summary: Some of Mailsploit test patterns are incorrectly
                    decoded
           Product: kmail2
           Version: 5.5.3
          Platform: Ubuntu Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: message list
          Assignee: kdepim-bugs at kde.org
          Reporter: kde at peremen.name
  Target Milestone: ---

The email address parsing problem, as discovered by the Mailsploit, persists in
various mail clients. Looks like KMail is not tested, I am filing a bug to
improve the current status.

Test the email at: https://www.mailsploit.com/index#demo

As of my KMail version 5.5.3, bugs are existing in both message list and
message viewer.

For message list, the following messages from Mailsploit shows incorrect sender
values:
 - Mailsploit: Mozilla-Thunderbird ≤ 52.5.0-like (via spoof\n\0
<spoof\n\0 at domain>)
 - Mailsploit: Variation #3 (via "spoof" <spoof>\n\0\0\0 <user at domain>)
 - Mailsploit: Variation #3.2 (via "spoof" <test>\n\0\0\0 <user at domain>)
 - Mailsploit: Variation #3.2 (via "spoof" <test>\n\0\0\0 <user at domain>)

For message viewer, I have Enterprise, Fancy, Standard, Brief headers and KMail
5.2. From my testing, only "Enterprise headers" shows incorrect sender values
for the following messages:
 - Mailsploit: Variation #5 (via spoof <user at domain>)
 - Mailsploit: Mozilla-Thunderbird ≤ 52.5.0-like (via spoof\n\0
<spoof\n\0 at domain>)

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