I find PHPMailer a great class to use; there's also opensource mailing list code for it (http://sourceforge.net/projects/phpmailer http://sourceforge.net/projec

I find PHPMailer a great class to use; there's also opensource mailing list code for it (http://sourceforge.net/projects/phpmailer http://sourceforge.net/projects/phpmailer) but haven't used that one personally.