instantlyemail.com is described as 'A temporary email service to protect you private email address. Avoid spam with a free disposable email address. If you don't want to give a real email, then use an instantly email' and is a Disposable Email Service in the Office & Productivity category. There are more than 50 alternatives to instantlyemail.com, not only websites but also apps for a variety of platforms, including Windows, Linux, Android and iPhone. The best alternative is MailDrop, which is both free and Open Source. Other great sites and apps similar to instantlyemail.com are Spamgourmet (Free, Open Source), 10 Minute Mail (Free), Burner Mail (Freemium) and Temp Mail by Privatix (Free).
Learn to Protect your Internet Identity. Single-use email address is a generated email address that is used only once when signing up for a service. It makes impossible for attackers to predict which email address was used for which service.
Simple free disposable email address service, unlimited free disposable email addresses. Create a new e-mail address whenever you need one. Maintain complete control over active addresses. Forwards all mail to your existing e-mail address. Never receive unwanted e-mail again.
Hushmail is a commercial email service focusing on security with features such as industry-standard OpenPGP encryption and two-step verification. All communications also use a secure SSL/TLS connection.
Moakt is a temporary mail that expires after an hour from the time it is created. Before expiring, you can use the email and receive emails as if they arrived to your inbox. In this one hour, the email you created is yours and no one will be able to use it but you.