We propose a system which allows users to monitor how their email addresses are used and how they spread over the Internet. This protects the privacy of the user and can reduce the spam phenomenon. Our solution does not require changes to the email infrastructure, can be set up by the end user on an individual basis and is compatible with any email client as long as emails are centralized on a server (e.g. an IMAP server). Nevertheless, it requires that people use email messaging quite differently