I work for a small not-for-profit with a limited (read: zero) IT budget. We use a number of HTML forms and a FormMail script to collect information on our website; mostly these are requests for publications, information, and the like.
Recently we decided we would like to accept referrals for our services the same way. The problem I pointed out is that the information is sent without encryption, so that would raise confidentiality issues.
Our website is on a virtual server, hosted by another company. We have (somewhat limited) access to the server, including a cgi-bin. What sodtware or scroipts can I use that are low-cost, easy to configure, and effective at sending an encrypted mail message from an HTML form on our server?