title: EXIM on Port 25 from WHM/cPanel on a Google Compute VM Instance
body: <p>I've set up a trial installation of WHM/cPanel on a Google Compute VM instance and it's considerably quicker (running and network response time) than my live WHM setup on a different and much more expensive dedicated server with RackSpace.</p>
  
  <p>But (after a longish time digging) I find that Google don't allow their VMs to send mail on port 25.</p>
  
  <p><a href="https://cloud.google.com/compute/docs/tutorials/sending-mail" rel="nofollow">https://cloud.google.com/compute/docs/tutorials/sending-mail</a></p>
  
  <p>WHM Support say:</p>
  
  <p>"If google VM is blocking port 25, there are no changes in WHM that will allow you to work around this. Exim MUST use port 25 to send/receive mail. The only other option would be to use a smart host, which would route the mail out through another server. This would require a second server configured for you to relay through it."</p>
  
  <p>Is there another solution? Two servers would make my costs higher than they are now and lose one of the major benefits to me of moving to Google Compute from Rackspace.</p>