spambox.us is described as 'With spambox you can create a temporary e-mail address that will forward all incoming mail to your usual e-mail address' and is a Disposable Email Service in the Office & Productivity category. There are more than 25 alternatives to spambox.us, not only websites but also apps for a variety of platforms, including iPhone, Android, Windows and Firefox. The best alternative is MailDrop, which is both free and Open Source. Other great sites and apps similar to spambox.us are Spamgourmet (Free, Open Source), 10 Minute Mail (Free), Mailinator (Freemium) and Temp Mail by Privatix (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 firstname.lastname@example.org 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.