I use [company]@[mydomain] when signing up for things. So far the only offender is a porn site I paid for for a while. I was getting weird scam emails sent to t

I use [company]@[mydomain] when signing up for things. So far the only offender is a porn site I paid for for a while. I was getting weird scam emails sent to that address daily, with text like "Hi [name of site], How are things? Is this your new email?". Surprisingly, when I cancelled my subscription, the scam emails stopped.