There are plenty of helpful descriptions of how to avoid angry emails. The reasoning is largely that it doesn't solve the problem. That is, sending an email whilst angry causes more problems for you than it solves.
But what about the recipient? Logically and analytically we know that people don't respond well to an emotive email. But is there statistical or experimental evidence of the changes in brain/body state (or behaviour) that occur when people receive emotive emails?
My question is: Is there evidence to suggest that receiving angry emails increases stress levels?