I got also an email from a guy because my domain name had been registered that same day, telling me to wait, sure you can automate the check, but at least the email didn't look automated.
Once I had some strong personal issues and spent a full 6-7 days without getting any sleep. At that point I was convinced that my neighbors (Pakistani) were from IS, I even started an investigation (using some tactics you can guess) in order to find evidence and was already seeking political asylum in the US. Now I think about it and it's even funny, but hell.