SUMMARY If you add a special character after your name e.g. "." or "," in your identity setup, kmail removes the "from field" when you use the reply function. STEPS TO REPRODUCE 1. add a special character in your identity setup 2. use that id and click "reply" 3. the "from field" goes away
it seems that it's fixed as I can't reproduce. 5.7.3 is very old (last is 5.14.2) Regards