Also called an anonymous remailer, an Internet site that lets you forward Simple Mail Transfer Protocol (SMTP) e-mail to recipients anonymously. You can use remailers to ensure the privacy of your e-mail address - for example, to keep recipients from adding your address to a mailing list. You can also use remailers to prevent yourself from being spammed when you voice an unpopular opinion on a mailing list or some other forum.
Yahoo! has a list of Web-based anonymous remailers.