To move a photo from an email message on iPhone to the "Photos" app...
Launch the Apple "Mail" app on the phone. Find the message containing the photo and open it. Do a long-press on the photo. Note: This means hold your finger on it for a second or 2, until a menu appears. In the menu, tap "Save" or "Save to Photos". This copies the photo into the "Photos" app.
Once it is in the "Photos" app you can just keep it there, print it, etc, just like any other photo.
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