30-08-2016 10:33 PM
EBay doesn't allow users to enter email addresses in messages.
If you would like to tell us more about what you're trying to do someone here may be able to advise you.
It isn't necessary to give out email addresses on eBay. If someone is asking you to do so it could be the beginnings of a scam. (Although you don't seem to have sold anything valuable enough to make this likely.)