Harakirimail - Harakirimail is a free disposable email service. Just send email to anythingyouwant@harakirimail.
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.
Protect IID - Protect your privacy with single-use email addresses
Spamgourmet - spamgourmet provides email addresses that get created automatically the first time they are used, forward messages, and then automatically expire.
Mailinator - Any Inbox. Any Time.
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.