Introduction
To set up a cPanel server to send outbound email through Google Workspace, the Smarthost option in Exim Configuration Manager can be used.
Procedure
Google Workspace (formerly G Suite) requires set up by the administrator to enable this functionality. Follow their instructions here:
SMTP relay: Route outgoing non-Gmail messages through Google
Once this is done, to configure the cPanel server to send email through Google Workspace, go to WHM's Home / Service Configuration / Exim Configuration Manager and search for the option, "Smarthost Support."
Enter an asterisk (*) and a space, followed by the value of the smarthost for the Google Workspace
* smtp-relay.gmail.com::587
Save Your Changes:
Go to the bottom of the page and click "Save." The changes will get added to the Exim configuration and will automatically restart the Exim service.
Test Your Settings:
Try sending a test email using one of the Webmail applications. If the email does not leave the server, you must examine the /var/log/exim_mainlog file to determine the cause of the issue. Reading and Understanding Eximlogs
Notes:
- This guide is intended for system administrators. cPanel's Technical Analysts cannot assist in configuring a server's Smarthost setup.
- Configuring a Smarthost will cause all outbound emails to go through the configured provider. This document's scope does not cover how to configure a subset of domains to go through a Smarthost; the server's system administrator must configure this.