Use routing rules for address-based forwarding; use an Email Worker when incoming mail needs custom processing. Fetch the linked docs before implementing APIs, DNS, configuration, or limits.

Task	Start here
Forward incoming mail to an existing mailbox	Route emails
Manage addresses, verification, catch-all rules, or subaddressing	Routing rules and addresses
Filter, parse, reply to, or store incoming mail	Email Workers
Send a new outbound message	Send emails — Workers binding, REST API, or SMTP

Forwarding requires verified destinations. Replying within an incoming email event and sending a new outbound message have different requirements; use the relevant API docs.

Reference map

Configuration: domains, rules, deployment, and local testing.
API: routing management and inbound/outbound operations.
Patterns: filtering, parsing, storage, and notifications.
Troubleshooting: authentication, delivery, and current limits.