So, a better measure of success is "conversion," defined as people who complete the action on your website's landing page by clicking the "submit" button to arrive at the "thank you" confirmation page.
As a result, your website's confirmation page, not your landing page, should be coded with programming script that identifies and reports conversions.
At minimum, your database should be able to record and report conversions by:
- subscriber
- subscriber source
- email campaign
- email domain (e.g. AOL)