[Poseidon]

did a quick google search

http://www.2createawebsite.com/enhance/ ... etter.html

http://www.chipmunk-scripts.com/scripts/newsletter.php

http://www.godandscience.org/general/mojomail.html

http://www.plus2net.com/articles/php_ne ... script.php

not sure if any of these work or know how good they are.