Configure SPF

Sender Policy Framework (SPF) specifies the servers that are allowed to send email for your domain. It helps protect your domain against spoofing and your outgoing emails from being marked as spam by receiving servers.

When registering with Google Workspace, it will automatically detect that your domain is registered with Cloudflare and will then guide you through a wizard to set up SPF (this is quick and easy).

You can also refer to this SPF guide for reference on setting up SPF.