Configuring your Internet mail gateway
There are dozens of mail servers available on the market. Some of the most popular include Microsoft Exchange, Novell GroupWise, and IBM Lotus Domino.
Search the Help system of your mail server for the terms “SMTP connector,” “SMTP relay,” or “relay host.” Look for a place where you can specify the SMTP relay host or connector for outbound messages. This is where you enter the customer-specific DNS record from the Service IP addresses page in the cloud portal, custXXXX- s.out.mailcontrol.com. If you cannot locate a place for this, contact your mail server vendor for assistance.