input: def send_automated_email(recipient_emails: List[str], sender_email: str, password: str) -> None:
      """ Sends an automated email to each email address in the recipient_emails list.
      >>> send_automated_email(['email1@example.com', 'email2@example.com'], 'example@gmail.com', 'example_password')
      Email sent successfully.
      Email sent successfully.
      """
      for email in recipient_emails:
          with smtplib.SMTP('smtp.gmail.com', 587) as server:
              server.ehlo()
              server.starttls()
              server.login(sender_email, password)
  
              subject = 'Automated Email from Program'
              message = 'Message body'
  
              server.sendmail(sender_email, email, 'Subject: ' + subject + '\n\n' + message)
              server.quit()
              print('Email sent successfully.')
output:     import smtplib