I have an email heavy-work life and so tracking email in my Evernote system just had to be smooth for me. I use Powerbot Gmail add-in (rather than the bcc: because it allows me to process and organise the email while in my email box.

And in my Evernote system, each action item is a different entry so it's pretty easy to slot these @waiting for or @action emails into evernote in one action.

You can read more about my setup here: http://enyonam.com/2013/01/02/gtd-in-evernote/