title: SSL certificate: unable to get local issuer certificate mailgun
body: <p>I have installed mailgun on my local machine.</p>
  
  <p>I am using <code>localhost:8000</code> to run my laravel project. I tried to send the message and I received this message</p>
  
  <pre><code>RequestException in Client.php line 136: 
  SSL certificate problem: unable to get local issuer certificate
  </code></pre>
  
  <p>Can anyone explain how it is solved?</p>