Papa John's has beefed up security for its Web-based email system after the pizza chain learned that internal email and <A HREF="http://news.zdnet.com/2100-1009_22-5938572.html?tag=zdnn.alert">customer data had been exposed.</A> The leak at the pizza chain made internal corporate email and thousands of customer comments available to anyone with a Web browser. The customer comments were submitted between Sept. 29 and Nov. 7 and included names, addresses, phone numbers and email addresses of customers.