SUMMARY
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STEPS TO REPRODUCE
1.   Create an email address that does NOT end in .com, .org, or .net.  In my particular instance, the domain is @tutor.science.  KMail can send using the email address given the server settings at mail.tutor.science for IMAP and SMTP.
2.   Go to Setttings/Configure KMail.  Then go to Accounts/Identities, then select  the active identity for the user.  
3.   Click Modify.
4.   Click Advanced on the new pop-up window.  Change Sent-mail folder to a server location folder, like someuser@tutor.science/Sent for Sent mail
5.  Then, click OK to save the changes.
6.  KMail will complain that "the email address you entered is not valid.  It does not seem to contain an actual email address, i.e., something of the form joe@example.org."

So, KMail is not programmed to accept email addresses with a top-level domain of .science?  

If I didn't say so already, I can set up KMail to send out email from my server at mail.tutor.science, so setting up configurations elsewhere in the application is not broken, but in this section of the settings to set up where Sent mail should be stored---on the server---is not allowed for the reasons KMail gives above.  

The programming seems not robust, but rather progammed case-by-case, checking .com, .org, .net, etc., but not allowing or checking any other top-level domain and throwing the user an error instead.  

OBSERVED RESULT


EXPECTED RESULT


SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION