Need a PHP SCRIPT which can automatically send a LICENSE KEY via IEM

Good day ! We are using INTERSPIRE EMAIL MARKETING to manage our mailing list. When someone visits the website and ask for free trial license, he automatically receives a welcome MESSAGE and 1 follow-up message. We need a PHP SCRIPT which can automatically send a LICENSE KEY to each client after the clients sign up to our mailing list. That KEY is an unique text line which must be included in each message We would like to SAVE THE LICENSE KEYS IN A TXT FILE somewhere and automatically deliver each LICENSE KEY to our subscriber. sample license key: fr.freelancer.com/4588 john doe fr.freelancer.com/4588 linux debian fr.freelancer.com/4588 windows xp fr.freelancer.com/4588 45687 feqfef 2. Each license must be ALSO saved in .CFG file and must be attached and send it along with the message. IF YOU HAVE OR YOU CAN MAKE ANY AUTOREPONDER OR MAKE INTERSPIRE ADDON which can allow us to automatically send License key, please post your offer.