Easy to integrate with our existing application (our customer's). The interface has been designed very well for developers who are new in this area of technology. There were some issues when we first used it but they have responded quickly and helped us solve all those problems easily. We could not find any cons as such at this moment while using veriMail api integration software from them. They provided best support services and also their team was extremely helpful throughout my entire project period till now. I am satisfied completely with their service quality so far. As mentioned above there may be minor bugs which might occur sometimes due tto server errors or network connection error etc., But nothing serious enough that can ruin your experience totally. Our business process flow gets improved tremendously after integrating with their platform. And one more thing i like most about them :- Free Trial offer! What else do.