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You could use UTM parameters on LP where the form is placed, and use those links in your emails - here's a great post on best practices to do the same - First, Last and Multi Touch attribution for UTM parameters and auto tagging emails
Hope this helps!
1 of 1 people found this helpful
Hi Stephen, the easiest way would be to include a parameter at the end of each of the links in your emails, as Balkar has suggested. These parameters can then fill in hidden fields on your form, or just be used in the constraints of the form fillout trigger.