Your Name and User ID in Emails
To help the eBay Community determine the difference between emails sent by eBay and spoof emails, eBay is going to start including a header in some of the emails that we send. This header contains the first and last name you registered on your eBay account, along with your eBay User ID.
Please, eBay, for the love of god! Use certificates! Headers can be spoofed.