title: how to check which port is being used to send emails?
body: <p>Emails are processing very slowly and on an average of 500 / 20 minute. and there is a queue of 40000 yet to be send. </p>
  
  <p>How to check which port is being used. There are two ports 25 and 26. I am not sure how to check which port is being used.</p>
  
  <p>Also how to check where SMTP error log is located.</p>
  
  <p>Thanks in advance.</p>