Only able to print email headers in MacMail

If you're still having problems with Mail try the following: boot into Safe Mode according to Start up your Mac in safe mode - Apple Support and test to see if the problem persists. Reboot normally and test again.

NOTE: Safe Mode boot can take up to nearly twice as long as a normal boot as it's doing the following; 

• Verifies your startup disk and attempts to repair directory issues, if needed

• Loads only required kernel extensions (prevents 3rd party kernel/extensions from loading)

• Prevents Startup Items and Login Items from opening automatically

• Disables user-installed fonts 

• Deletes font caches, kernel cache, and other system cache files

Hi msvincedis, thanks for posting here in Apple Support Communities. We understand that you've been experiencing issues printing emails from your new Mac computer. By any chance, have you already checked the advanced print settings? If not, let's see if adjusting some of those settings helps: Choose advanced print settings on Mac - Apple Support

Another option would be to save emails as files or PDFs and then print them out from there: Save emails as files or PDFs in Mail on Mac - Apple Support

We hope that helps.

Cheers!

msvincedis.

Thanks for keeping us posted. Just so that we're on the same page, are you referring to the print settings under the "Show Details" section of the print dialog?

In addition to that, would you be okay with testing this issue in another user account? A new user would be best: Set up users, guests, and groups on Mac - Apple Support

Please keep us posted on the results.

Log into a basic admin user test account, Set up users, guests, and groups on Mac,  and see if the problem persists. This tells us if the problem is limited to your user account or is system wide.