Fastmail and Gmail support a local suffix of the form yourname+amazon@gmail.com. That&#x27;s a plus character between the local name and local suffix. If you use a password manager, you can replace a predictable suffix like &quot;amazon&quot; with random hex value.<p>Unfortunately, many sites borked their e-mail address validation and do not accept the plus character. (Amazon permits it.) Also, you&#x27;ll ocassionally find a customer service ticketing system that expects replies to come &quot;From&quot; your account&#x27;s e-mail address. (Many mail clients can alter that header, but it&#x27;s a pain.)