Use an Email Worker's email() handler for custom processing of incoming mail. Use routing rules for simple address-based forwarding. Fetch current documentation before implementing the handler or its dependencies.

Operation	Documentation
Forward to a verified destination, reject, or reply within the incoming event	Email handler API
Send a new message or a later response	Sending Workers API
Parse and store mail for later processing	Email storage and processing

message.raw is a single-use stream. If parsing and archiving both need the raw content, plan how to reuse it rather than reading the stream twice. Forwarding destinations must be verified; reply requirements are documented separately from outbound sending.

Reference map

Configuration: routing, bindings, local development, and types.
API: message actions, MIME, and sending.
Patterns: filtering, storage, attachments, and background processing.
Troubleshooting: stream handling, authentication, limits, and errors.