Show date and time received in mail

Hello Graham 3,

Thanks for using Apple Support Communities. We understand you are having issues with viewing the date and time of incoming emails. We’re happy to help. 

To start, make sure that your Date & Time preferences on your Mac are correct: Change Date & Time preferences on Mac - Apple Support

If that doesn’t help, restart your Mac in safe mode to see if the issue persists: Start up your Mac in safe mode - Apple Support

Lastly, try creating a new user account to see if the behavior is present there: Set up users, guests, and groups on Mac - Apple Support

Let us know if that helps.

Have a great day.

This setting applies when you are NOT using Column Layout:

If you are you using Column Layout, you can control-click on any heard and check or uncheck the columns you want:

Have you tried click on the specific e-mail and View in Menu Bar of Mail and use "See RAW " - pardon me - not on apple computer at the moment and picking from grey cells ( memory )