Dear Maintainer, Since the beginning of 2026, messages sent via Kmail (Kontact) no longer appear in the Sent Items folder. The messages are indeed sent and received, but saving them seems to be malfunctioning. No error messages appear in the logs. I don't know where to look to fix this problem. I haven't found any help in the KDE mailing list, which is why I reported this bug.
Solved : The KMail configuration settings for the Sent Items folder and other folders like Drafts and Templates were incorrectly configured. This misconfiguration appears to date back to early December 2024. I don't know the cause, as I've never configured these settings since I started using KMail in early 2007.
using Thanks for the followup. I have also noticed that some of the recent updates (especially if upgrading daily in testing when not all the new packages have migrated) have caused these setting to be altered or reset.