Remove duplicate emails in sample tracking notifications
Fix #169 (closed)
Using MDN's implementation of Remove duplicate elements from the array on https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set.
Fix #169 (closed)
Using MDN's implementation of Remove duplicate elements from the array on https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set.