Hi guys, I've been struggling with the: "INVALID IPN ERROR". I think I'm closer but still don't know the solution to this: IPN Notification email address did not match receiver. Transaction ID: 22S21064HG590451Y Payer Email: mikehumphrey@rcn.com If you are testing in the sandbox and are using 3rd party code, make sure you change that portion of the code from LIVE to TEST mode. I commented out what I HAD in my third party code that I bought and put in the sandbox URL. <!-- POST BACK FOR VALIDATION --> <!--- <cfhttp url="https://www.paypal.com/cgi-bin/webscr?#str#" method="get" resolveurl="false"> </cfhttp> ---> <cfhttp url="https://www.sandbox.paypal.com/cgi-bin/webscr?#str#" method="get" resolveurl="false"> </cfhttp> Mike Humphrey Catholic Apologist and Web Developer http://www.mikeswebsites.com http://www.cpats.org "Promoting Catholic Apologetic support groups loyal to the Magisterium" We are Catholic Christians who clarify teachings and correct misperceptions on the web about the One Church, Our Blessed Lord Jesus established on St. Peter. Check out our knowledge base: http://www.cpats.org/answers and sign-up to receive Holy Quotes: Holy Quotes: http://www.cpats.org/holyquotes "Quotes from the Early Church Fathers and first Christians of the Church"