Delivery Status Notification (Failure)

Address not found Your message wasn't delivered to Rafif@gmail.com because the address couldn't be found, or is unable to receive mail. LEARN MORE

The response was: 550 5.1.1 The email account that you tried to reach does not exist. Please try double-checking the recipient's email address for typos or unnecessary spaces. Learn more at https://support.google.com/mail/?p=NoSuchUser bp42-20020a05651215aa00b004d578b8fbd7sor1402179lfb.119 - gsmtp