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How to Setup a cPanel & WHM Server as a Smarthost

Zachary Karr
  • Updated

Introduction

 

Many providers now block outbound connections on port 25, which means that a cPanel system would need to configure a smarthost to allow for outbound emails to function. This resource covers how to setup a smarthost using a second cPanel server on a different network.

 

Procedure

 

In the following instructions "Webserver" refers to the system that is on a network that blocks port 25 while "Mailserver" refers to a second system that will be used to relay email through.

 

On the Webserver configure the following:

 

WHM »Service Configuration »Exim Configuration Manager »Basic Editor

 

Smarthost support - * <mailserverip>::587

 

On the Mailserver configure the following:

 

WHM »Service Configuration »Exim Configuration Manager »Basic Editor

 

Trusted SMTP IP addresses - <webserverip>

Backup MX hosts - <webserverip>

 

DNS Settings:

 
The MX records should point to the Mailserver's IP, while SPF records should include the Mailserver's IP.

 

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