title: Create unique body request in postman for API-test
body: <p>I want to create test request on postman with unique email property in the request body.</p>
  
  <pre><code>{
      ...
      "email": "{{email_string}}.com",
      ...
  }
  </code></pre>
  
  <p>I've set <code>email_string</code> with static string in enviroment, but is there any way that I can set <code>email_string</code> dynamically before request occured?</p>