Yep, artpants is absolutely right.
Sounds like it could be a phishing scam to me also. Never clink on any link sent to your inbox, no matter who they say they are. Always go direct to the site and login to check your details there.
Some of these email scams look like the real deal, but if you click the link they provide and enter your details, you are actually giving your information to someone about to rip you off.
Just log into your ebay account, if it lets you do that then check your messages to see if there is anything there, but I would doubt if it is for real, especially if you have no idea why they would suspend your account.
If your account is actually suspended, get straight onto ebay to confirm what the issue is.