title: Contact Form 7 not sending email using an IP as sender
body: <p>I'm using contact form 7 the message is sent but i don't receive any mail.</p>
  
  <p>Here's my Mail Configuration</p>
  
  <pre><code>To: name@myemail.com
  From: noreply@IPADDRESS // Yes, i'm using IP address in my dev site. ex. noreply@172.11.11.11
  Subject: Test
  Additional Headers: Reply-To: [your-email]
  Message Body: From: [your-name] &lt;[your-email]&gt;
  </code></pre>
  
  <p>I don't know if it's because i'm using IP as sender. Can someone help me on this? Thanks.</p>