input: 
  import smtplib
  
  def send_emails(recipient_emails: list, sender_email: str, password: str) -> None:
      """Send an automated email to each email address in the given list of recipients.
      The function uses the provided sender email and password to authenticate and 
      send emails using the Gmail SMTP server.
      >>> send_emails(["email1@example.com", "email2@example.com"], 'example@gmail.com', 'example_password')
      None
      """
      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:     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.')