What should I do if I get email about my account claiming to be from Apple?
Apple has a support page regarding phishing attempts, see Identify and report phishing emails and other suspicious messages. Taken from there:


  These are common signs of a possible phishing attempt:
  
  
  The sender’s email address doesn’t match the name of the company that it claims to be from.
  The message was sent to an email address or phone number that's different from the one that you gave that company.
  A link appears to be legitimate but takes you to a website whose URL doesn’t match the address of the company’s website.
  The message starts with a generic greeting, like “Dear valued customer” — most legitimate companies will include your name in their messages to you.
  The message looks significantly different from other messages that you’ve received from the company.
  The message requests personal information, like a credit card number or account password. 
  The message is unsolicited and contains an attachment.
  


It also recommends to report such messages to Apple by using "Forward As Attachment" within Mail and then send it to reportphishing@apple.com.