title: My magento site can't sent email to the customer
body: <p>Does anyone know why Magento 1.4 fails to send email notifications for a new order and  account activation ? 
   when I submit the Contact us form it gives the below error.</p>
  
  <p><code>Unable to submit your request. Please, try again later</code>Any idea/suggestion on this will be highly appreciated. </p>