[UPHPU] Email Counter

[Webot Graphics]

Is there a way to make an email counter using PHP (or anything else)  
to count (and possibly the ip address) when an email is viewed  
(without a database would be best)?

Basically I work for a company that sends out a free email newsletter  
almost monthly to previous customers. 2 days ago we sent one out and  
we got back an email saying

"Hi guys, it's nice to here from you. How do I place an order with you?"

After reading  sitepoint's  "Do You Underestimate Your Users?"  
article, i feel i am not doing the greatest job with our newsletters,  
and I would like to be able to track views, button clicks, etc.

Thank you