title: How to remove "dead.letter" File which left no free space in root directory
body: <ol>
  <li>Today I noticed that dead.letter file is created in my root directory on one of the EC2 instances.</li>
  <li>After some look up I came to know that this is created because of some incomplete or terminated email functionality.</li>
  <li>It has size of 6 GiB and it left no free space in root directory.</li>
  <li>I have deleted the file still my root directory shows no free space available.</li>
  </ol>
  
  <p><strong>Any idea how to remove this file and free up the root space?</strong></p>