Step 1: Add Intermedia's Outgoing IPs to your Account

 
64.78.0.0/18 199.193.200.0/21 205.217.20.0/24 206.40.48.0/24 206.225.164.0/22 207.5.72.0/22 207.5.76.0/23

Step 2: Configure Smarthost Forwarding

Important: To forward outgoing mail to an external smarthost, you must submit an Extended Service request with Intermedia.
 
Outbound Email Routing Article ID: 2230 Direct Path: http://kb.intermedia.net/article/2230
 

 
How do I use the Extended Services portal? Article ID: 1360 Direct Path: http://kb.intermedia.net/Article/1360