If you can provide more information (email provider, device type, app configuration), maybe someone in the forum can help you out. https://forum.k9mail.app/
- 'Auto-fit messages' setting did not persist - Edge-to-edge move/copy regressed with 3-button nav - Swiping message left/right could abort prematurely - Outlook SMTP failed authentication for some accounts - Gmail folder prefixes appeared after refreshing folder list - Quiet time preferences were ignored - Thunderbird could crash after deleting an account