My emails appear by sender and subject but will not open to read contents

Hello RomeoRomeo24,

Thanks for reaching out to us in Apple Support Communities about not being able to read email messages on your Mac, we're happy to help by looking into this more! 

So we have a better understanding of what's happening, does this issue happen with all messages, or only messages from one particular sender?

Are you able to read the message if you open the message in the account directly? For example, if this is an iCloud email, can you read the email message at iCloud.com, or if this is a Gmail email account, can you read the message at gmail.com?

Finally, does closing and launching the Mail app again, help?

How about restarting your Mac, does that help?

Log out, sleep, wake, restart, or shut down your Mac

Best Regards.

RomeoRomeo24,

Thanks for the additional information. We're glad to hear that you're dealing with Apple Support. At this point it would be best to continue working with them directly on this issue.

Best Regards.