Postmark helps to deliver transactional emails for web applications. In a nutshell, the service replaces SMTP with a far more reliable, scalable and care-free environment. HostBill integration allows you to send transactional emails, triggered by certain user action such as: account confirmation, order receipt, password reset etc. using Postmark Mail. Postmark transactional email services ensure better delivery rate for all of your important messages to improve your customer satisfaction and increase revenue preventing you from loosing your customers.