input: from typing import List
  
  
  def send_emails(recipients: List[str], sender_email: str, password: str) -> None:
      """ Sends automated emails to a list of recipients using the provided sender's email and password.
      The email content has a default subject "Automated Email from Program" and message body "Message body".
      >>> send_emails(["email1@example.com", "email2@example.com"], "example@gmail.com", "example_password")
      Email sent successfully.
      Email sent successfully.
      """
output:     import smtplib
      from email.mime.text import MIMEText
      from email.mime.multipart import MIMEMultipart
  
      subject = "Automated Email from Program"
      body = "Message body"
  
      for recipient in recipients:
          msg = MIMEMultipart()
          msg['From'] = sender_email
          msg['To'] = recipient
          msg['Subject'] = subject
          msg.attach(MIMEText(body, 'plain'))
  
          with smtplib.SMTP('smtp.gmail.com', 587) as server:
              server.starttls()
              server.login(sender_email, password)
              server.sendmail(sender_email, recipient, msg.as_string())
              print("Email sent successfully.")