Mailexpire is described as 'Our system allows you to create a free email alias for yourself. For a period you choose, from 12 hours to 3 months, anything sent to this email alias will be passed on to you at your actual email address. You can now give this alias to that salesman you're not sure of' and is an website in the Office & Productivity category. There are more than 25 alternatives to Mailexpire, not only websites but also apps for a variety of platforms, including Windows, iPhone, Firefox and iPad. The best alternative is MailDrop, which is both free and Open Source. Other great sites and apps similar to Mailexpire are Spamgourmet (Free, Open Source), 10 Minute Mail (Free), Mailinator (Freemium) and Guerrilla Mail (Free).
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.
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.
Tempr.email is a service for temporary email addresses (Temp mail), also called trashmail addresses or fake email addresses. The service was founded in 2004, at that time still under Discardmail.com and later Spambog.com. Tempr.
Harakirimail is a free disposable email service. Just send email to email@example.com and let us deal with the email (and all spam). And after 24H the email performs harakiri (seppuku), and you never have to see it again.