Mail7 is described as 'developed a first of its kind Email Workflow Testing tool for Software Developers and Testers. You can instantly create as many disposal emails as you want and set automation via our APIs' and is a Disposable Email Service in the Security & Privacy category. There are more than 50 alternatives to Mail7 for a variety of platforms, including Online / Web-based, SaaS, Windows, Android and Firefox. The best alternative is AnonAddy, which is both free and Open Source. Other great apps like Mail7 are MailDrop (Free, Open Source), Spamgourmet (Free, Open Source), 10 Minute Mail (Free) and Burner Mail (Freemium).
MailDrop is a free throwaway e-mail address. It's temporary. It's transient. It's disposable. It's meant for those times when you don't want to give out your real address. Just give someone any e-mail address in the maildrop.
Spamgourmet provides disposable, optionally self destructing, email addresses that get created automatically the first time they are used, forward messages, and then automatically expire after number of specified messages received.
Guerrilla Mail gives you a disposable email address. You can give your email address to whomever you don't trust. You can read the email using Guerrilla Mail, click on any confirmation link, and even reply.
Bouncr allows you to hide your permanent email address behind an '@boun.cr' address. You then share it however and with whomever you wish. Anytime you're receiving unwanted emails, simply cancel your Bouncr address and it's gone.