How can I find text in the message of an email (Apple Mail or Outlook)?

Post date: 2018-01-10 22:15:25
Views: 5
I would like to be able to look for a bit of text (e.g., "XXYY") in the subject OR the message of an incoming email, and flag it to myself somehow. I have found ways to apply rules in Apple Mail to the text of the incoming subject, but not the body of the email. I could also implement it in Outlook if it's a possibility there.
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