Instant Email Address is described as 'Free Throwaway Email Address service. 250Kb message size. If you put a password on your account you need to log in' and is an website in the Office & Productivity category. There are more than 50 alternatives to Instant Email Address, not only websites but also apps for a variety of platforms, including Windows, SaaS, Firefox and Linux. The best alternative is MailDrop, which is both free and Open Source. Other great sites and apps similar to Instant Email Address are AnonAddy (Freemium, Open Source), Spamgourmet (Free, Open Source), 10 Minute Mail (Free) and Mailinator (Freemium).
Tempinbox is a free temporary email service that can be used to receive disposable email from any website without using your own personal email. Use our service as you wish we don't care about spam emails :).
Rain Mail is free temporary email service, you can create a free temp email address to use for registrations on social media or newsletters etc. addresses are valid forever but are public and emails are deleted after 24 hours.
FakeMail is a free temporary email address generator and throwaway email service provider offering temporary, secure, anonymous, free, disposable email addresses where you can receive email temporarily but self-destructs after a certain time.