Each email client has its own way of forwarding an Email. Some wrap the original message in a div with a unique class name. Others aren't so nice.
Unforward is a tool for retrieving the original email body and email address in a chain of forwarded emails.
Example:
var unforward = require('unforward');
var emailHtml = '......';
unforward(emailHtml, "html", function (err, original, debugInfo)
{
console.log("Original Sender", original.sender);
console.log("Original Date", original.date);
console.log("Original Body", original.html);
}