[kmail2] [Bug 452825] New: "Request delivery confirmation" not working

[Samuele]

https://bugs.kde.org/show_bug.cgi?id=452825

            Bug ID: 452825
           Summary: "Request delivery confirmation" not working
           Product: kmail2
           Version: 5.19.2
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: samuele.zappala at mail.com
  Target Milestone: ---

Created attachment 148282
  --> https://bugs.kde.org/attachment.cgi?id=148282&action=edit
Screenshot of the sources of the messages.

SUMMARY
Every time I try to send an email requesting delivery confirmation the email
isn't sent and I receive a notification that says: "Failed to transport
message. Server error: Syntax error in parameters or arguments"

STEPS TO REPRODUCE
1. Write a new mail message
2. Select the option to request a delivery confirmation under Options > Request
delivery confirmation
3. Look at the outcome

OBSERVED RESULT
Instead of simply sending the mail with the request, I get an error.

EXPECTED RESULT
It should send the email with the request annexed.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: KDE Neon 5.24
KDE Plasma Version: 5.24.4
KDE Frameworks Version: 5.93.0
Qt Version: 5.15.3

ADDITIONAL INFORMATION
The SMTP account I'm using to send emails is set to store the password and uses
the SSL/TLS port 465 with PLAIN authentication. The issue appears also with
STARTTLS port 587.
This happens with a @mail.com account and not with a @gmail.com account, but
with the latter I still don't receive the confirmations.

I inspected the sources of the two messages, the one I tried to sent with
@mail.com (and was never sent) and the one sent with @gmail.com (that was
actually sent).
I thought that such "syntax error" could be seen from the source. I see that
they are very different.

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