Checkout Issue on Paypal: Invalid Email Address … Post author:larry Post published:Dec 20, 2005 Post category:Diary Check access rights for the key, certificate, and those directories holding these files! Not the email address issue, but the issue is that webserver can’t access the key or cert. thus it couldn’t pass it to Paypal. You Might Also Like London Olympics 2012 Jul 27, 2012 1st Sourcing Trip Jul 13, 2005 Deployment of WordPress Shopp Feb 18, 2014