Code used to be at http://www.w3schools.com/PHP/php_mail.asp and http://www.w3schools.com/PHP/php_secure_mail.asp

Note: For the mail functions to be available, PHP requires an installed and working email system. The program to be used is defined by the configuration settings in the php.ini file.

This script worked from acasun.eckerd.edu, wtcourse.com (GoDaddy server 2012), wtclass.org (1&1 server 2014), and after removing the filter addition, it also worked from eckserver.