title: How to fix Missing Message-ID in zend-mail
body: <p>I try to use zend-mail. I can send an email, but zend-mail didn't generate the message-id automatically, so I get this <code>Message-Id</code>:</p>
  
  <pre><code>&lt;1xxxx.xxxxx.xxxxxxxxxSMTPIN_ADDED_MISSING@mx.google.com&gt;
  </code></pre>
  
  <p>when I check the original message.</p>
  
  <p>so I've searched on Google &amp; Zend-mail page and GitHub, but can't find how to add the <code>message-id</code>.</p>
  
  <p>I tried this code to set the <code>message-id</code>:</p>
  
  <pre><code>require('vendor/zendframework/zend-mail/src/Header/MessageId.php');
  use Zend\Mail\Header\MessageId;
  
  $messid = new MessageId();
  $messid-&gt;setId(); 
  </code></pre>
  
  <p>but still no <code>message-id</code>.</p>