Woomail

Woomail is a web-based e-mail and messaging service designed to combat the security problems associated with conventional e-mail, most notably spam, virus sending and spyware. Users can send messages to regular e-mail accounts as normal, but in order to reply the recipient must use the Woomail user's contact page, otherwise the return e-mail is ignored, unless the address is added to a contact list. Only then, or if the addressee also signs up for a Woomail account, can the two users reply directly to each other's messages.

Woomail also provides "merchant keys", a special address such as This email address is being protected from spambots. You need JavaScript enabled to view it. which can be used to register for sites that require an e-mail address, including forums and online shopping sites. The user generates a new merchant key for each site they sign up to, allowing them to see if any site has passed on their address. Deleting a merchant key will block any incoming message to that address.