I have infinity. I use Gmail for business with a catchall rule that forwards to the one address in my domain.

I have an email address for every site I sign up for.

Helps you figure out who sells your email.

How do you handle this? Or do you not?

I guess you could do a DNS lookup of the mail exchange records and see if it points back to gmail and compile a list of domains to allow one account from... but then that would break many companies emails. That’s no fun.