title: Splitting a file in linux based on content
body: <p>I have an email dump of around 400mb. I want to split this into .txt files, consisting of one mail in each file. Every e-mail starts with the standard HTML header specifying the doctype.</p>
  
  <p>This means I will have to split my files based on the above said header. How do I go about it in linux?</p>