Bug 458874

Sending an e-mail to a distribution list (group) is not possible anymore. The mail remains in outbox. 
Error Message: Invalid recipient adress. 
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STEPS TO REPRODUCE
1. Create a group with one or two valid e-mail adresses in kaddressbook.
2. open a new e-mail in kmail
3. select the group via recipient picker
4. enter a subject/some text
5. send the mail
6. sending the mail fails, remains in outbox, group name in recipient address is changed, in my example from "Test Gruppe" to "TestGruppe@localhost.localdomain" 

OBSERVED RESULT
Sending an e-mail to a group fails

EXPECTED RESULT
Sending an e-mail to a group works as before (previous versions)

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: openSUSE Tumbleweed 20220906/5.25.4
(available in About System)
KDE Plasma Version: 5.25.4
KDE Frameworks Version: 5.97.0
Qt Version: 5.15.5

ADDITIONAL INFORMATION
issue appears on another installation also.