input: Write a python function to send an email notification when an event is triggered.
  assert send_email_notification('SENDER EMAIL', 'RECEIVER EMAIL', 'YOUR PASSWORD') == True
output: import smtplib
  from email.mime.text import MIMEText
  from email.mime.multipart import MIMEMultipart
  
  def send_email_notification(sender_email, receiver_email, password):
      subject = "Event Notification"
      body = "An event has been triggered."
  
      msg = MIMEMultipart()
      msg['From'] = sender_email
      msg['To'] = receiver_email
      msg['Subject'] = subject
  
      msg.attach(MIMEText(body, 'plain'))
  
      try:
          server = smtplib.SMTP('smtp.gmail.com', 587)
          server.starttls()
          server.login(sender_email, password)
          text = msg.as_string()
          server.sendmail(sender_email, receiver_email, text)
          server.quit()
          return True
      except Exception as e:
          print(f"Failed to send email: {e}")
          return False