This is just something called a Phishing email.
Whoever sent you this email sends the exact same email out to thousands of people.
The email didn't come from Ebay. It came from a scammer. They put things like "your account is locked" or "your account is going to be disabled" so that you will panic and then click on the link in the email to stop this happening.
They send this email out with a link in it and ask you to click on the link to go to the "Ebay" web site.
Actually, then link goes to the scammers web site that is made to look exactly like Ebay. A fake Ebay web site.
I really hope you haven't clicked on the link and gone to the scammers "Ebay" web site. If you have, then the scammers will now probably have your username/password.
Never click on a link from anyone. Ebay never sends out emails asking you to confirm your details or password.
To your original question, tracing the IP address is going to be a waste of time. The people that send these emails are very clever and they will already have thought of that.
It's likely the email was sent from a hacked computer and not one owned by the scammer.
Read more here:
http://en.wikipedia.org/wiki/Phishing
and here:
http://pages.ebay.com/education/spooftutorial/