The new K9mail is great and not as tired as the old version.
Is it possible to include an OAuth2 authentication option when setting the Authentication in Incoming server settings? I have a Gmail account that prefers this setting and I believe that Yahoo mail does too. I currently have to set my Gmail account to Less secure app access which is not ideal, to get Gmail to work. I believe OAuth2 is now the de facto industry standard for online authorization and would sit well with the new version of K2mail.