title: PHP mail() function - which daemon it is tied to in Linux
body: <p>I am working on a production server I inherited, and I do not know whether mail is turned "on" for this server or not.</p>
  
  <p>I'm posting this because I did a search and didn't find these specifics. Questions I've seen focus on the mail() function and not the mail daemon or process on the server.</p>
  
  <p>This should work and return true:</p>
  
  <pre><code>echo $result=mail('myemail@me.com','test email','hello Clarice','From: tests@mysite.com');
  </code></pre>
  
  <p>However it echoes nothing.</p>
  
  <p>How do I find if either PHP mail is turned on or off, or if the process on the SERVER is just not turned on?  Thanks.  I am pretty sure mail is not being sent out nor has been ever sent out from this particular service.</p>