title: send mail is not working
body: <p>for ex :  i ahve aliases  : </p>
  
  <p>testuser </p>
  
  <pre><code>sendmail -v testuser@localhost &lt; t.mail , this is working 
  </code></pre>
  
  <p>but when i am trying from another host </p>
  
  <p><code>sendmail -v testuser@host.company.com &lt; t.mail</code> .. its not working .. i am not receiveing mail </p>
  
  <p>what is the issue how to reslove it </p>