Dear kanchana thanaporn,
Your Apple ID (dexhearmak@hotmail.com) was used to sign in to iMessage on an iPhone 4s named “Administrator’s iPhone”.
Date and Time: November 25, 2014, 11:10 PM PST
If the information above looks familiar, you can disregard this email.
If you have not recently signed in to an iPhone with your Apple ID and believe someone may have accessed your account, go to My Apple ID (https://appleid.apple.com) and change your password as soon as possible.