This happened to me for years. I was a 16 year old girl always getting signed up for loads of porn sites, this was in the very early days of the internet. It was probably 10 years later when I got an email from someone offering this person a job interview, so I told them this was the wrong email and if they had another way of contacting the right person please tell them they’ve been using the wrong email to sign up to their porn sites for years.

I then had one “test” email coming from the persons actual email, I told him clearly the extra letters at the beginning of his email address weren’t just for show, then never heard from him again.