Get a received email's raw content

Returns the original message exactly as received, in RFC 5322 (MIME) format, as a message/rfc822 download. Use it when you need the exact bytes: full headers, signatures, or your own MIME parsing. For parsed fields use Get a received email and Get a received email's body. Returns 404 when the message is unknown or its stored content has expired (received emails are retained for 30 days).