[kmail2] [Bug 442224] New: Enabling "Undo Send" cause recipient rejected due to null sender

[Matteo Brutti]

https://bugs.kde.org/show_bug.cgi?id=442224

            Bug ID: 442224
           Summary: Enabling "Undo Send" cause recipient rejected due to
                    null sender
           Product: kmail2
           Version: 5.15.3
          Platform: Debian stable
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: webmbackslash at gmail.com
  Target Milestone: ---

SUMMARY
Enabling "Undo Send" cause every message sent is rejected due to "Failed to
transport message. Server error: 5.7.1 <xxxx at example.com>: Recipient address
rejected: Policy rejection due to null sender"


STEPS TO REPRODUCE
1. settings => configure kmail => tick "Enable Undo Send"
2. send an email

OBSERVED RESULT
Server does not send the email giving:
"Failed to transport message. Server error: 5.7.1 <xxxx at example.com>: Recipient
address rejected: Policy rejection due to null sender"

EXPECTED RESULT
email sent

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 5.20.5
KDE Frameworks Version: 5.78.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION
Debian: 11

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