So I have hatched a plan, which might keep one Email channel free. The new address is unshake@unshake.co.uk, but messages on this channel will be rejected, unless they contain a certificate generated by Unshake, either as the Subject or in the plain-text body of the message. (If you are not sure what encoding you are using for the body of your message, make the certificate the subject.)
In order to send a message, just run Unshake and click the "Mail Cert." button. This will open a window containing a string of characters which you can paste into your Email message. This certificate will be valid for 5 days. Make sure the clock is right on your computer!
This is a very simple system, there's no point in being sophisticated when anyone can run the code to generate a certificate, but I doubt a spammer would bother to do that, so I can easily reject spam automatically without worrying that a "spam-filter" might reject genuine messages.
21/7/2003 WET.