title: Sending Email using IP Address instead of Domain Name
body: <p>I am trying to avoid running through DNS servers to get an email message to an address on one of my hosted virtual accounts.</p>
  
  <p>I know I can surround the IP address with square brackets but how do I designate the mailbox username for the (virtual) hosted account on the server?</p>
  
  <p>In other words,</p>
  
  <ul>
  <li>I have multiple domains hosted on a virtual server -- all sharing the same IP address</li>
  <li>obviously, user@domain.com works fine</li>
  <li>but how do I send to user@[123.456.78.90]</li>
  </ul>
  
  <p>Is what I want to do, possible?</p>
  
  <p>Thanks.</p>