This plugin will save UTM tags + Referrer (like google.com, etc) + landing (first page) to cookies on first user visit and on CF7 submit adds all info to mail body. Please note that for security/privacy reasons, the Referer URL is stripped out when navigating from a HTTPS site to a HTTP site by the browser and in some other cases. Setup: place [utm_and_referer] tag in the Admin email body – example A UTM codes is a simple query variables that you can attach to a custom URL in order to track a source, medium, and campaign name. This allow you better understand from where visitors are coming and doing some actions (like submitting contact form).
