You can track mail stats. How many people read your emails. How many people you reach? (Only in 1.6 beta) Vukuf© is designed for high performance sending. It is a high performance software. It’s performance depends your mail servers performance! For example; you can send 100.000 email message in 1 hour. You know what performance means if you use GroupMail. GroupMail is paid, but Vukuf© is not!