Your Apple ID was used to sign in to iCloud via a web browser....

..Cookie J..

Always doubly check for validity against possibility of someone nosing around.

Never just reply to an email from the internet. But instead use that as a warning;

that you are open to suggestions from anyone, who may want to target you in a

phishing, malware, spoof, &/or other game. Where you could only lose; and yet

the opposition could gain from identity theft of your personal life. And anything

of value that may tie into your life and or that of your family, business or country.

You should login and check your Apple ID; however unless you've done so recently

the odds are ~ someone may be snooping around to get some info to victimize you.

If there are shared accounts, or Apple IDs, those need to be corrected; as those

are personal details and not generally intended; as security risks may result.

Login via this portal:

https://appleid.apple.com/

Advice and official links from Apple Support to check and adjust your Apple ID are

adequately posed for your use by WheelieNick and other login details from Apple

are online that also help legitimate access to your Apple ID and iCloud online.

Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

//support.apple.com/en-us/HT204759

While I've checked via login to see where my iCloud items are in use, settings, etc

online through a secure browser, I've not seen any email from Apple telling me so.

By nature, almost instinctively, bells and whistles should sound to alert you; also

know that unless you initiate a process with official Apple, that shouldn't happen.

Follow these steps just to be sure:

1. Change your Apple ID password
2. If your Apple ID password has been changed by someone else, reset your password.
3. Go to appleid.apple.com to update any of personal or security information that isn't correct or that you don't recognize.
4. Check with your email address* provider to make sure that you control every email address associated with your Apple ID. If you don't control an email address, work with your email provider to regain control or use a different email address.

See this link for further reference

If you think your Apple ID has been compromised - Apple Support