For that to work the destination server, in this case Gmail, would have to know to deliver mail addressed to [email protected] into your Gmail mailbox. In this example it's a limitation on the Gmail side.
Domains and subdomains are handled by DNS which is why Cloudflare can E2E proxy them. Email mailboxes are handled by an application running on a server.
Domains and subdomains are handled by DNS which is why Cloudflare can E2E proxy them. Email mailboxes are handled by an application running on a server.