eBay's email address format is usually username@ebay.com. The username part can be any combination of characters selected by the user when registering, followed by @ebay.com as the domain name. This format is the standard email address format and complies with the specifications of the Internet Mail Protocol.

With this format, users can send and receive emails on eBay, communicate and interact with other users, and receive notifications and reminders from the eBay platform. Please note that this is just a common format. In fact, eBay may also provide email addresses in other formats to meet the needs of different users.