You can't sell them on eBay. Due to fraud issues (seller and buyer alike),. they have been banned from eBay.

I bought e-tickets to an MLB game on eBay and got an email with the tickets attached. I can no longer go to the game and want to resell the tickets on eBay but I'm not sure how to do this since I got them attached in an email...(how would the buyer verify that I'm not selling multiple copies of the same tickets?)

Never sold on eBay before. Any help would be greatly appreciated.