approach to fighting spam. Your idea will not work. Here is why it won't work. (One or more of the following may apply to your particular idea, and it may have other flaws which used to vary from state to state before a bad federal law was passed.)
(X) The amount of energy involved would likely destroy the planet.
(X) Many email users cannot afford to lose business or alienate potential employers
Specifically, your plan fails to account for
(X) The relative sparseness of non-dark energy in our vicinity
(X) Huge existing software investment in SMTP
and the following philosophical objections may also apply:
(X) Incompatiblity with open source or open source licenses
