What do we do now when we get too much spam in a mailbox? We trash it and set up a new one. It's a one-step-ahead-of-the-enemy approach, but it's extravagent. Suppose instead of just assigning people an e-mail address, we assigned them an e-mail domain, with the ability to set up an infinite number of subdomains (or channels, if you prefer), each with a short and finite life. Example: Let's say my e-mail address is dave.pollard@hotmail.com (it isn't -- I use my real e-mail address sparingly in public because of spam etc.) Instead of junking this address when the spammers overwhelm it, suppose instead I had an e-mail domain: dave.pollard@hotmail.com/ and could create any subdomains I want, and abandon them when they've lost their value.