title: A sed script to fix an invalid RFC2822 email header
body: <p>I have emails coming into a processing system, and some of them have started coming in with an invalid blank line splitting the email headers, like this:</p>
  
  <pre><code>Date: Thu, 7 Mar 2013 22:24:44 +0000
  Message-ID: &lt;86A1035194F72547A2979A7767CD3BAF35485B8D@QTS-MB02.ecicloud.com&gt;
  References: &lt;C0DA0966847B31409025BBD9A70187DA35399D17@QTS-MB02.ecicloud.com&gt;
  
  Accept-Language: en-US
  Content-Language: en-US
  </code></pre>
  
  <p>The blank line in the middle is invalid and causes problems for downstream programs.</p>
  
  <p>I'd like to come up with a simple <code>sed</code> script to fix any occurences specifically of <code>Accept-Language:.*</code> preceded by a blank line, so that the blank line is eliminated.  </p>