title: In MailChimp, how would use a merge tag to check whether someone's using Gmail?
body: <p>Using merge tags in MailChimp, how would I go about detecting whether the recipient is using Gmail, and display a message in the header accordingly?</p>
  
  <p>As an example, here's what I've got in my header now, which fires if a <em>certain</em> email address is encountered (as opposed to if gmail.com is seen in the email domain):</p>
  
  <pre><code>*|IF:EMAIL=someone@gmail.com|*
  Using Gmail? Drag this message to your Primary tab.
   *|END:IF|*
  </code></pre>
  
  <p>Knowing that MailChimp merge tags also supports the following:</p>
  
  <pre><code>*|IF:EMAIL != someone@gmail.com|*
  You are not someone@gmail.com ...you must be someone else.
   *|END:IF|*
  </code></pre>
  
  <p>Is it possible to show a message in the header only when the recipient is a Gmail user? What operator would I use? Clearly it's not = and it's not !=</p>