Not op, but what you described is called a catchall address. Easily done with custom domain. Basically a regex for *@domain.tld, every mail sent to (anything)@d

Not op, but what you described is called a catchall address. Easily done with custom domain. Basically a regex for *@domain.tld, every mail sent to (anything)@domain.tld will arrive at a preconfigured mailbox, say admin@domain.tld etc