Before you begin this process make sure you add SPF, DKIM, DMARC, and ADSP Records
To properly protect your outbound mail, add your SPF, DKIM, DMARC, and ADSP records while you're in there changing your MX record.
We have a primer on what all these are for, if you're interested here: Email Authentication and Phishing Protection - An Explanation and Exploration
We have a Knowledge Base articles for each of these:
After you have done the outbound authentication configurations you can begin to configure your server for outbound relay.
Outbound Set Up for MailRoute
Login in to admin.mailroute.net with your Admin credentials.
Under Delivery in the menu, select Outbound Servers. Enter the IP addresses of each of your email servers.
*You will need to request permission for Outbound relay and agree to the terms and conditions. Your request will reviewed and enabled by a customer support team member. Do not proceed with your outbound configuration until outbound is confirmed and enabled.
cPanel Configuration for Outbound Relay
cPanel uses the Exim mailserver, so you'll need to to configure your outbound SmartHost/RelayHost using the Exim Configuration Manager on your cPanel server.
1. To configure Exim, open the cPanel WHM and navigate to the Exim Configuration Manager in the Service Configuration section of the sidebar men:

2. Before you make any changes, be sure to back up the current Exim configuration in the Backup tab.

3. Select the Advanced Editor tab. Search for the text “POSTMAILCOUNT", and enter the following into the text box:
smart_route:
driver = manualroute
domains = !+local_domains
transport = remote_smtp
route_list = * outbound.mailroute.net::25
If you want to know more about the format of the route_list line, take a look at the Exim manualroute documentation.
4. Finally, don’t forget to scroll to the bottom of the Exim Advanced Editor, where you’ll find the save button. Once you’ve done that, all email originating from your server is relayed through the Smarthost.
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Contact sales@mailroute.net or support@mailroute.net for more information.
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