With Mailinator, you can sign in with Google. This is one of the few anonymous email service providers that can do this. Like the Guerrilla Mail, it can only be used for a specific period of time and does not need registration or password to use it. If you want the recipient to know the mail is from you, you can use email@example.com even though your original mail is firstname.lastname@example.org. The purpose of this is to protect your main box email@example.com from spam or other unsolicited messages.