I waited until my Gmail doppelganger ordered a pizza, then from the phone and address details in that email I was able to text him and say I hoped he enjoyed the pizza, that his house looked nice from Street View, and please stop using my email address. He did.
I kept getting receipts from a nice grandmother from Missouri (at least I think it was Missouri, but that detail doesn’t matter). I don’t live in Missouri. However, she must have had a similar gmail account. But she couldn’t get her email address right. It was fine for a while, just the typical odds and ends emails. Then I started getting shipping receipts and return information from a clothing company. And then receipts for holiday presents for kids. Eventually I had to use the info in the emails to write and actual letter to this woman, letting her know about the email mixup. I only knew her address from billing information on the prior receipts.
In retrospect, I probably should have printed the emails and then sent those too. That may have been taking the bit too far, but it would have been much funnier from my POV.