input: from typing import List
  
  def send_email_task(recipient_name: str, recipient_email: str, subject: str, message: str) -> bool:
      """This function defines a Celery task to send an email to the given recipient with the specified subject and message.
      >>> send_email_task('John Smith', 'john@example.com', 'Hello World', 'This is a test email.')
      True
      """
output:     from celery import Celery
  
      app = Celery('tasks', broker='pyamqp://guest@localhost//')
  
      @app.task
      def send_email(recipient_name, recipient_email, subject, message):
          # Simulate sending an email
          print(f"Sending email to {recipient_name} at {recipient_email} with subject '{subject}' and message:\n{message}")
          return True
  
      return send_email.delay(recipient_name, recipient_email, subject, message) is not None