Good advice from Apple.
Phishing refers to an email that attempts to fraudulently acquire personal information from you, such as your Apple ID, password and/or credit card information. On the surface, the email may appear to be from a legitimate company or individual, but it’s not.
As a general rule, never send credit card information, account passwords, or extensive personal information in an email unless you verify that the recipient is who they claim to be. Many companies have policies that state they will never solicit such information from customers by email.