SUMMARY By default I (am forced to) use as my primary e-mail address <matija [at] šuklje.name>, which translates to <matija [at] xn--uklje-udb.name>. Since I changed my primary Identity in KMail to that, it stopped populating the From field when I’m writing e-mail in KMail. STEPS TO REPRODUCE 1. set your primary Identity to have an e-mail address with a non-ASCII character (e.g. š) 2. write an e-mail – either new or as a reply OBSERVED RESULT Notice that the From field is empty, even though the right default Identity is automatically selected. EXPECTED RESULT Have the From field populate as expected. SOFTWARE/OS VERSIONS KDE Plasma Version: 5.27.6 KDE Frameworks Version: 5.108.0 Qt Version: 5.15.10 ADDITIONAL INFORMATION This is quite annoying because for every single e-mail I send, I now need to manually select the Identity. In addition, I noticed that answering to calendar invitations through KMail started throwing errors that it cannot send the e-mail, which I suspect is connected to the issue with the From field being empty.
When interacting with a calendar invite in KMail I get the following error: 5.1.7 Bad sender address syntax Looking at the Outbox, this is the address it tries to send from – so clearly an issue with encoding (change “ [at] ” for “@”, of course): <matija [at] =?utf-8?B?xaF1a2xqZQ==?=.name> If I switch the default Identity back to <matija [at] suklje.name> it works fine.