When an email is sent to a number of addresses, kmail allows one to save these addresses as a list (using kontact, I guess). This is a very nice feature, which doesn't work properly though. For if one selects this list as the recipient of a new email, it is not replaced by the addresses on the list. Instead, the email is (wrongly) sent to the name of the list.
My solution is to select each entry on the list seperately and add it as a recipient, but this almost abandons the advantage of having lists. And don't try to select several addresses at the list; it will crash the program.

(openSuSE Leap 42.3)