Another fun thing to do when you have your own email on your own domain is create all sorts of fun little forwarders/aliases so you can give out addresses that aren’t your main one, track who passes the address you gave them along to spammers, and delete the alias addresses whenever you like.

For example, you want to buy some cheese from the site Cheesemonger.foo and you need to give them an email address when creating your account. So, you give them cheesemonger@yourdomain.foo which is an alias you set up to forward to your real email inbox, and you receive mail from that site as normal. If you then start getting spam email sent to cheesemonger@yourdomain you know for a fact where the spammers got the address, and you know to delete that forwarder and buy your next batch of cheese elsewhere because screw those address-selling jerks at Cheesemonger.foo.