why is my email not showing content

dshamblen wrote:

email is not showing content in mail

try disabling all Open mail app select Mail>Settings>Privacy

• “Protect Mail Activity”
• “Hide IP address”
• “Block all remote content”

compare your results, reboot if necessary.

Follow this discussion. I only fixed my issue be reinstalling the OS after a full erase of drive

https://discussions.apple.com/thread/254504347