To send mail through another provider (Google Workspace, Microsoft 365, Amazon SES, SendGrid, and similar), you often need an extra include in your SPF record. You can manage that in cPanel.
1
Open Email Deliverability
In cPanel, go to Email Deliverability.
2
Choose the domain
Click Manage next to the domain you want to edit.
3
Customize SPF
Wait for the current records to load, then under SPF click Customize.
4
Add the include
After the records load again, under Additional Settings, choose Add a new “+include” item and enter the host you were given (for example _spf.google.com).Click Install a customized SPF record to save.