title: How to know from which email client the HTTP request was coming from?
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/4085332/email-client-detection">Email client detection</a>  </p>
  </blockquote>
  
  
  
  <p>I have a newsletter which will have a link to my websites pages. Now i want to know which email client (gmail, hotmail, outlook) the user opened the newsletter in and clicked the link to the website page.    </p>
  
  <p>The reason I want to know which email client, is because i want to customize the content in website pages based on the use of email client by users.</p>
  
  <p>My Website pages will be coded in PHP</p>