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I registered my family name with an s on the end and set up catch-all email. Got a load of spam but one address in particular seemed different. Important stuff like doctors appointments were coming in. Eventually I logged into a shopping website with the email and found a mobile number and sent a tentative message. Turns out the guy had the same domain but with 5 on the end. Every time he wrote it on a form somebody thought it was s, so I just set a forwarding address for him.