How to split delivery of a single domain, between cPanel and Exchange/Outlook365, Google Workspace?

Question

Is it possible for an administrator to have some email addresses on their domain hosted by cPanel, and some hosted by a third party, such as Microsoft or Google.

Answer

By default, our Exim configuration does not provide the option for splitting delivery of a domain between two different locations. Adding this feature requires advanced configuration, beyond the features cPanel offers. Many users have reported success using the method discussed in these forum posts:

cPanel Forum | Using cPanel and Office 365 in a hybrid scenario

cPanel Forum | Local mail but pass through external provider - prevent local resolve with split delivery