Posted 25 March 2011 - 08:14 PM
Its really only two possibilities:
1. Someone is attempting to hack your YouTube account (not likely unless you are a large channel or have alot of enemies).
2. It's a mass scam email that is attempting to get your YouTube password.
Either way just do the following:
1. Delete that message
2. Login to YouTube and change your password yourself
If you want, you could also scan your PC for viruses/malware, but if you're not noticing anything else going on with your PC/passwords, I wouldn't worry too much about malware.