Hi Wendy, I did this recently and also asked about it on these forums but no-one seemed to know. I will be changing my server because NBN is steadily bearing down on this area and so I have changed my email to gmail whilst I sort it out. I changed my email with both Paypal and eBay and found that any sales from  listings with my old email address went through ( must have been changed to the new email address automatically)! I have since gone through all my listings and changed my Paypal email address to my current one. Sales seemed to flow steadily with no problem!