Email deliverability, inbox placement, subscriber engagement rates and all these terms we have heard and read but not sure of how they work. What they are up to in email marketing? The process in which an email travels from the sender to the subscriber's inbox is quite different in great old days. The giant ISPs like Google, Hotmail and Yahoo have changed the way of evaluating the efficiency of email campaigns with engagement rates and behaviour of the customers instead of evaluating the effici...