• A secure Inbox for you to receive important alerts about your account that require your immediate attention.
• A central location to send, receive and manage member-to-member communications (Ask a Question, Contact eBay Member, Second Chance Offer).
• Customer Support correspondence and replies.
• Useful information about buying and selling.
• News about upcoming activities and events.
• Copies of your seller invoices for listing and final value fees.
• Policy changes and other special notices.
• Convenient access locations in My eBay and elsewhere.

For more details read the My Messages FAQs