Please do not reply to any email asking for your username, password, date of birth, social security number, credit card numbers or other sensitive data. These are an attempt to steal your identity, otherwise known as a phishing scam.
 
If a phishing scam makes it into your inbox, report it to Gmail. While looking at the message, click the three dots in the upper right of the message. That will open a menu of options. Click the "Report Phishing" option. If you have any questions about the validity of any emails, please contact us.

Gmail email message menu with report phishing option

Google will review the message and decide whether to add it to their spam filters.  If they do, you will have helped the Gmail community as the message will now go to users' spam folders rather than their inboxes.