Here’s a case.
I order something online, and hook to the order confirmation page.
Then soon I receive an email confirming the order, so I hook to that and link to #1
Later the order is shipped and I receive an email that it is on the way, and I hook the the second email and link to #1
Finally, the shipper sends me an email with delivery status, and I hook this email and link it to #1.
It would be fantastic (perhaps magical) if as soon as I’ve done #1 and #2, then, when emails #3 and #4 show up, Hook knows that I am going to want to link them to #1. Because it’s magic I don’t need to be concerned about how Hook figures this out (tracking numbers maybe) – but it would really be nice.
Something to noodle on?