Thanks Jon.
We have marked the opt-out links in our deliveries however a click on these links doesn't necessarily mean the user has followed through with an unsubscribe.
The link in our case takes the user to a landing page (Preference centre) where the user can then opt in/out of one or more subscriptions.
What we'd like to track (probably from the Preference centre) is:
1) The traffic source (name of the delivery) that the user came from in order to land on the preference centre.
2) The opt-ins/outs from each subscription type that followed once the user landed on the preference centre.
I was considering appending an identifier to the unsubscription link (delivery name maybe) that I could then pass back to Campaign whenever the user opts in/out of a given subscription but thought there might be some OOB tracking functionality that could achieve what is needed with less effort.
Thanks,
Cg