title: Sender address is not valid when send email Codeigniter
body: <p>I will make mail delivery system using PHP CodeIgniter. Email successfully submitted, but when I check my email, the sender mail is my <strong>smtp_user</strong>, not the real email sender.</p>
  
  <p>for example: My <strong>smtp_user</strong> is a@gmail.com. When user send mail to me, sender mail is a@gmail.com, not user@gmail.com.</p>
  
  <p>Here is my code in <strong>email.php</strong> :</p>
  
  <pre><code>$config['wordwrap'] = TRUE;
  $config['protocol'] = "smtp";
  $config['smtp_host'] = "ssl://smtp.gmail.com";
  $config['smtp_port'] = "465";
  $config['smtp_user'] = "a@gmail.com";
  $config['smtp_pass'] = "blablabla";
  $config['charset'] = "utf-8";
  $config['mailtype'] = "html";
  $config['priority'] = "1";
  $config['newline'] = "\r\n";
  </code></pre>
  
  <p>And here is my controller :</p>
  
  <pre><code>$this-&gt;load-&gt;library('email');
  $link=base_url()."verification/".$verification_code."";
  $body="Thanks for joining &lt;br&gt; Your code verification is 
        &lt;a href=".$link." target='_blank'&gt;".$link."&lt;/a&gt;";
  $this-&gt;email-&gt;from($this-&gt;input-&gt;post('mails'), strtoupper($name));
  $this-&gt;email-&gt;to('b@gmail.com');                        
  $this-&gt;email-&gt;subject('New account registration');
  $this-&gt;email-&gt;message($body);
  $this-&gt;email-&gt;send());
  </code></pre>
  
  <p>What's wrong with my <strong>config email</strong>?</p>
  
  <p>but if I using smtp_host with mandrillapp, I did'nt see the problem like above.</p>