function recordEmailConversion(email) {
            return new Promise(function(resolve, reject) {

              const url = "//"
                + location.hostname
                + "/api/conversions/email-collected"
                + location.search

              const xhr = new XMLHttpRequest

              xhr.onreadystatechange = function() {

                if (xhr.readyState !== XMLHttpRequest.DONE) {
                  return
                }

                if (Math.floor(xhr.status / 100) !== 2) {
                  return reject(xhr.responseText || "Network Error")
                }

                try {
                  var response = JSON.parse(xhr.responseText)
                }
                catch (error) {
                  return reject("Failed parsing server response: " + error.toString())
                }

                resolve(response)
              }

              xhr.onerror = reject

              xhr.open("POST", url)
              xhr.setRequestHeader("Content-Type", "application/json; charset=UTF-8")

              xhr.send(JSON.stringify({
                email,
                page_id: 24,
                page_version: "i" || undefined,
                referrer: document.referrer,
                request_id: "A29EDE17:D180_C0A85015:01BB_66B7C3FD_14D535:25D66E" || undefined,
              }))
            })
          }