So I've gotten some emails similar to the past, but this is the first one I've gotten like this about a specific CD key, and I don't completely understand them. (The previous emails were to discover all email addresses associated with this Steam account
)
What exactly does this email mean? Is someone trying to figure out what game(s) I have so they can attempt to hijack my account?

Steam said:Dear Steam User,
This is an automated message generated by Steam account administration. It is being sent in response to a query made by a Steam user to discover all account names associated with this CD-key.
Steam account name: anderson010
You can use the above account name to log in to Steam. If you can't remember your password, click on the "Retrieve lost account" button on the Steam login screen.
The Steam Support Team
http://www.steampowered.com
What exactly does this email mean? Is someone trying to figure out what game(s) I have so they can attempt to hijack my account?