fishing "App Store" mail

Looks like a scam. See Identify legitimate emails from the App Store or iTunes Store - Apple Support and Avoid phishing emails, fake 'virus' alerts, phony support calls, and other scams - Apple Support

Check your latest account activity in https://reportaproblem.apple.com and verify that your personal data, phone, backup emails, etc. are all okay at https://appleid.apple.com.

Apple will always address you by your name or the name they have on file for you, not Dear Customer, Dear Client or by using your e-mail address. The e-mail will be from @apple.com or @iTunes.com. E-mail addresses can be spoofed. You can go to Mail/View/Message/Show all Headers to see more. Apple e-mails will never contain an attachment. Apple will never request personal information such as Social Security numbers.

The only exception to the above I have noticed is if you order something from the Apple Store (apple.com), your receipt will be addressed to Dear Apple Customer. That is a receipt for a purchase you initiated.

Identifying legitimate emails from the iTunes Store

Send the e-mail to Apple as an attachment to a new e-mail before deleting it. You can forward as an attachment by going to Mail/Message/Forward as attachment.

reportphishing@apple.com