input: 
  from typing import Dict
  from celery import Celery
  from flask_mail import Message, Mail
  
  app = Celery('tasks', backend='redis://localhost')
  mail = Mail(app)  # Assuming Flask-Mail is configured within the Flask app context
  
  @app.task
  def send_email(email_info: Dict[str, str]):
      """Create a Celery task to send an email using the given email_info dictionary.
      The email_info dictionary should contain: recipient_name, recipient_email, subject, and message.
      Example input:
      email_info = {
          'recipient_name': 'John Smith',
          'recipient_email': 'john@example.com',
          'subject': 'Hello World',
          'message': 'This is a test email.'
      }
      Example output:
      No returned value, but the email should be sent.
      """
      msg = Message(email_info['subject'], sender='example@example.com', recipients=[email_info['recipient_email']])
      msg.body = email_info['message']
      mail.send(msg)
  
output:     msg.body = f"Dear {email_info['recipient_name']},\n\n{email_info['message']}"