title: Parsing MIME header with regular expression
body: <p>I need to extract email address from MIME header in 3 particular cases (they are different due to different email servers that deliver the email - it was a single email sent to multiple (3) recipients).</p>
  
  <pre><code>1. Received: by oiax69 with SMTP id x69so5491756oia.2 for &lt;myaddr1@mydomain1.biz&gt;; Sun, 31 May 2015 15:39:45 -0700 (PDT)
  2. Received: by oiav63 with SMTP id v63so5487624oia.3 for &lt;myaddr2@mydomain2.com&gt;; Sun, 31 May 2015 15:39:46 -0700 (PDT)    
  3. Received: by oiav63 with SMTP id v63so5493687oia.0 for &lt;myaddr3@mydomain3.com&gt;; Sun, 31 May 2015 15:39:45 -0700 (PDT)
  </code></pre>
  
  <p>What would be the right regular expression to extract the email address?
  Important to note that each one of them is just a piece of a larger string both before and after...</p>