I have a domain just for emails, so any mail sent to the domain goes to me, so I can just sign up for a site as hackernews@mydomain.tld or whatever system i wan

I have a domain just for emails, so any mail sent to the domain goes to me, so I can just sign up for a site as hackernews@mydomain.tld or whatever system i want for naming stuff. I still get every mail to the same mailbox, but if I start getting spam, I know which site sold my email, or got hacked.