Unrelated to FB, but one of the things that popular email clients (Gmail, Hotmail, Yahoo, etc.) could be doing is a "forward without links" feature (or even "fo

Unrelated to FB, but one of the things that popular email clients (Gmail, Hotmail, Yahoo, etc.) could be doing is a "forward without links" feature (or even "forward without links with credentials" by detecting for query params in links and only excluding those), where it'd be enabled when forwarding an email (you can manually disable it if you know what you're doing).