Include email source data when forwarding spam to [Agency/Gov] reporting addresses

Feature Request: When a user reports spam to an official agency (e.g., report@phishing.gov.uk), Thunderbird should automatically detect the endpoint using pattern matching and prompt the user to forward the message as an attachment (.eml format) rather than inline, preventing the loss of critical routing headers like DKIM, SPF, and Received: chains necessary for cyber investigators. This logic could either intercept a manual forward with a prompt asking to attach the original source data, or as an alternative, it could be integrated directly into Thunderbird’s existing "Spam / Junk" button to automatically package and auto-route the pristine email source data to the designated agency upon click.