To make sure this doesn't happen again, update your mail flow rules. In the Exchange admin center, go to the Rules page. ...


To make sure this doesn't happen again, update your mail flow rules.
  1. In the Exchange admin center, go to the Rules page.
  2. Click on the rule that deleted the email, and do one of the following:
  • Click Edit to customize the rule to fit your needs.
  • Click Delete to remove the rule entirely.