[dolphin] [Bug 443297] New: Send via Email shows "Unable to create io-slave. Unknown protocol 'mailto'."

[chimak111]

https://bugs.kde.org/show_bug.cgi?id=443297

            Bug ID: 443297
           Summary: Send via Email shows "Unable to create io-slave.
                    Unknown protocol 'mailto'."
           Product: dolphin
           Version: 21.08.1
          Platform: Kubuntu Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: chimak111 at gmail.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

SUMMARY
Right-clicking on a file and then choosing Share > Send via Email... shows
"Unable to create io-slave. Unknown protocol 'mailto'."

STEPS TO REPRODUCE
1. Right-click on a file in Dolphin. Choose Share > Send via Email...
2. 
3. 

OBSERVED RESULT
A window titled "Error --- KIOExec" appears with "Unable to create io-slave.
Unknown protocol 'mailto'."

EXPECTED RESULT
My preferred E-mail client should open (set to Firefox Web Browser) in System
Settings > Applications > Default Applications > Email client

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: Kubuntu 21.04 with beta ppa installed
(available in About System)
KDE Plasma Version: 5.22.90
KDE Frameworks Version: 5.86.0
Qt Version: 5.15.12

ADDITIONAL INFORMATION
Happens in both Wayland & X11

-- 
You are receiving this mail because:
You are on the CC list for the bug.