title: How can I use mail() with redhat, I can't send mail
body: <p>I am experiencing a problem since a week....
  I installed a redhat web server 6 and I upload my file. It work but nor the form.
  When I want to send a form, I got this error message :</p>
  
  <pre><code>object(SocketException) {
      [protected] _attributes =&gt; array()
      [protected] _messageTemplate =&gt; ''
      [protected] _responseHeaders =&gt; null
      [protected] message =&gt; 'Could not send email.'
      [protected] code =&gt; (int) 500
      [protected] file =&gt; '/var/www/step/lib/Cake/Network/Email/MailTransport.php'
      [protected] line =&gt; (int) 76
  }
  </code></pre>
  
  <p>The form use the mail() function of PHP.</p>
  
  <p>I have no idea, what should I configure on my redhat web server to let him send e-mail.</p>
  
  <p>The ports smtp, www, ssh are open</p>
  
  <p>I also install postfix but it did not solve my problem.</p>
  
  <p>Someone know what can I do?
  Should I installed something and how to configure it?</p>
  
  <p>Many thank for your help in order to use the function mail()</p>