SimpleLogin is described as 'Open source solution to protect your personal email address. Generous free plan with uncapped bandwidth and infinite sends/replies, self-hostable, lot of powerful features, open roadmap, you can count on SimpleLogin to guard your email inbox' and is an app in the Office & Productivity category. There are more than 50 alternatives to SimpleLogin for a variety of platforms, including Online / Web-based, Firefox, SaaS, Google Chrome and Windows. The best alternative is MailDrop, which is both free and Open Source. Other great apps like SimpleLogin are AnonAddy (Freemium, 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.