code: def send_email_message(self, recipient, subject, html_message, text_message, sender_email, sender_name):
          
  
          if not current_app.testing:  # pragma: no cover
  
              # Prepare email message
              from flask_sendmail import Message
              message = Message(
                  subject,
                  recipients=[recipient],
                  html=html_message,
                  body=text_message)
  
              # Send email message
              self.mail.send(message)
docs: Send email message via Flask-Sendmail.
  
          Args:
              recipient: Email address or tuple of (Name, Email-address).
              subject: Subject line.
              html_message: The message body in HTML.
              text_message: The message body in plain text.