OwlyMail is described as 'is free temporary email generator that allows you to generate free temp email. You can use temporary email for facebook or temporary email for twitter'. There are more than 50 alternatives to OwlyMail, not only websites but also apps for a variety of platforms, including Windows, Linux, Firefox and Mac. The best alternative is MailDrop, which is both free and Open Source. Other great sites and apps similar to OwlyMail are Spamgourmet (Free, Open Source), 10 Minute Mail (Free), Burner Mail (Freemium) and Mailinator (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.
YOPmail’s free, quick and feature rich service guards you against spam, phishing and other online abuses. Protect your actual email, instead use YOPmail’s disposable one to sign-up wherever you want. YOPmail creates temporary inboxes of your choice instantaneously.