There are varying level of masking. I would consider an email myusername+random@domain.com as a masked address. Of course it is trivially unmasked. But assuming

There are varying level of masking. I would consider an email myusername+random@domain.com as a masked address. Of course it is trivially unmasked. But assuming I am willing to accept that, it does offer a different tradeoff with respect to convenience. It's true though that is fairly trivial to manually add +random