title: Postfix vs. Apache James
body: <p>Is there a difference between the two? Do they perform the same tasks? </p>
  
  <p>I'm a little confused as I'm not too familiar with email servers, but I'm trying my hand at building one primarily to send transactional email from <code>Java</code> and there is very little documentation on <code>Apache James</code>. At the moment I do have it running properly, but I'm running into issues getting <code>DKIM</code> working properly with it and the frustration has made me consider changing.</p>
  
  <p>So...is <code>Postfix</code> a suitable <code>Apache James</code> replacement? Will I need anything other than <code>Postfix</code> to send email from <code>Java</code>?</p>