Mailinator - Any Inbox. Any Time.
MailDrop - maildrop is a Mail delivery agent used by the Courier Mail Server. The maildrop MDA also includes filtering functionality. maildrop receives mail via stdin and delivers in both Maildir and mbox formats.
TempMail.altmails - Disposable temporary email addresses
Spamgourmet - spamgourmet provides email addresses that get created automatically the first time they are used, forward messages, and then automatically expire.
Harakirimail - Harakirimail is a free disposable email service. Just send email to anythingyouwant@harakirimail.
Guerrilla Mail - Guerrilla Mail is a web-based app that provides a disposable and anonymous email address. Users of the service are not required to set up an account in order to send or receive emails.