Cloudflare Email Routing: forward hello@example.com to an external inbox
Prerequisites: the domain is on Cloudflare DNS (nameservers delegated, DNS Setup = Full), and it has no other MX records (Email Routing owns the MX set).
Dashboard > Email Service > Email Routing > Destination Addresses > Add address.
Enter the external inbox (e.g. you@gmail.com). Cloudflare emails a confirmation link;
click it. The row must read Verified.