title: PHP mail function does not send email to valid account on same domain
body: <p>I'm using the mail function as follows:</p>
  
  <pre><code>mail($emailto, $subject, $body, $headers);
  mail('askme@mysite.com', $subject.' / '.$emailto, $body, $headers);
  </code></pre>
  
  <p>The first is intended for the enduser. The second copy is for me for record keeping purposes.</p>
  
  <p>Soometimes the enduser specifies their email address, other times its blank.</p>
  
  <ol>
  <li>When an email address is specified, the end user actuallys gets the email without any problem</li>
  <li>However, no email gets sent to askme@example.com in EITHER case - I've checked the spam folders as well.</li>
  </ol>
  
  <p>In my /mail/new folder I see many FILES created similar to the below. The error is incorrect as askme@mysite.com is a VALID email address (setup using google for domains).</p>
  
  <blockquote>
  <pre><code>  Return-path: &lt;&gt;
    Envelope-to: myuserid@myhostingprovider.com
    Delivery-date: Mon, 28 Jun 2010 12:37:28 -0400
    Received: from mailnull by myhostingprovider.com with local (Exim 4.69)
        id UNIQUEIDZ-7x
        for myuserid@myhostingprovider.com; Mon, 28 Jun 2010 12:37:28 -0400
    X-Failed-Recipients: askme@mysite.com
    Auto-Submitted: auto-replied
    From: Mail Delivery System &lt;Mailer-Daemon@myhostingprovider.com&gt;
    To: myuserid@myhostingprovider.com
    Subject: Mail delivery failed: returning message to sender
    Message-Id: &lt;EUNIQUEIDZ-7x@myhostingprovider.com&gt;
    Date: Mon, 28 Jun 2010 12:37:28 -0400
  
    This message was created automatically by mail delivery software.
  
    A message that you sent could not be delivered to one or more of its
    recipients. This is a permanent error. The following address(es) failed:
  
      askme@mysite.com
        No Such User Here
  
    ------ This is a copy of the message, including all the headers. ------
  
    Return-path: &lt;myuserid@myhostingprovider.com&gt;
    Received: from nobody by myhostingprovider.com with local (Exim 4.69)
        (envelope-from &lt;myuserid@myhostingprovider.com&gt;)
        id UNIQUEIDV-6b
        for askme@mysite.com; Mon, 28 Jun 2010 12:37:28 -0400
    To: askme@mysite.com
    Subject: mysite.com: SUBJECT / enduser@gmail.com
    X-PHP-Script: www.mysite.com/mysitescript.php for IPADDRESS
    MIME-Version: 1.0
    Content-type: text/html; charset=UTF-8
    From: mysite.com Service &lt;askme@mysite.com&gt;
    Message-Id: &lt;EUNIQUEIDV-6b@myhostingprovider.com&gt;
    Date: Mon, 28 Jun 2010 12:37:28 -0400
  </code></pre>
  </blockquote>