A customizeable way to allow visitors to subscribe (opt-in) to a web site's newsletters or other promotions and to unsubscribe (opt out) from future emails. Uses web page 'skins' to display a pre-programmed Perl/CGI subscribe/unsubscribe function. This feature allows the output to be tailored to the existing design of a web site. Date is stored in a flat-file (e.g. no SQL, MySQL or other 'high-end' support facilities required) and is reviewable online as a comma-delimited display that is password protected. No SSI required.