It's a scam,
the reason he wants you to e-mail him personally is because it is not his account. The real account owner got duped into a fish e-mail where he mistakenly gave all his ebay info to a fake ebay site. (update your account or it will be suspended) etc. Beware of those e-mails, a good way to tell if they're real or not is to scroll over the link listed in the email without clicking on it, after a second or two it will show the real address you will be re-directed to. Hope this info helps someone from being scammed!
Moose
