When I open an email there is no content

Hi wednesdaythursday,

Thanks for using Apple Support Communities. We understand you're running into an issue with email, and we're happy to help.

We see that you came to Apple Support Communities from this article: If you can’t send or receive email on your Mac - Apple Support. So, we’re assuming it’s an issue with Mac Mail then. We’ll focus our troubleshooting for that device.

Does rebuilding your email boxes resolve the issue? Rebuild mailboxes in Mail on Mac - Apple Support

If not, do the email appear complete if you restart your Mac in safe mode? Here’s how: Use safe mode on your Mac - Apple Support.

We want you to be aware that restarting in safe mode may take a bit longer than usual since it prevents some software from loading and does a check of your startup disk. You may also see some graphic anomalies on your screen as well. Whether or not you see the complete email, restart your Mac normally to exit safe mode.

If you were able to see the content in the emails you received while your Mac was in safe mode, see if they’re complete after a normal restart

Please let us know the results when you're able. Also, if you’re not having an issue with a Mac, please let us know what device you're using.

Thanks.