mail has no content-fix

Issue: “mail has no content”

I posted this in the Monterey forum but should also apply to Ventura.

This is not the easiest fix but the only one that worked for me (should work for either Monterey or Ventura):

 After trying every suggestion, I finally (as a last resort) booted into recovery, erased my drive and reinstalled the OS (Monterey, 12.6.3).  I then migrated my files, apps, etc. from my TM backup.  This fixed the mail issue.  I tested this for the last 7 days (150 emails) and the mail is rock solid.  I’m guessing somewhere along the way after some OS security update the issue started. 

NOTE:  Before reinstalling the OS I tried updating to Ventura but the issue continued.  I also tried just reinstalling the OS not touching the data volume but that did not work.  I had to erase the drive and start over.