I downloaded Samsung Mail app to be used with Dex..
I tried to use the same with Samsung Keyboard supplied with Tab S7.. control and shift buttons on the keyboard don't function properly in the Mail app.. else for all other apps including Outlook and Gmail app they work fine...
Some bugs in Samsung Mail app to be removed..
Outlook works best for me with those true dark modes. And now they have given option to swipe left a nd right to delete or mark as read. In Samsung mail, you have to swipe then tap to do this. Also 8n outlook you can mark as read or delete mail from notification itself.