Ranked in these QuestionsQuestion Ranking
Pro Awesome support
They are available 24x7, and are very happy to help you.
Pro Simple APIs to send emails
Simple HTTP APIs, which are easy to understand and integrate. Complete documentation with sample code snippets for different programming languages. Refer the documentation for more details: http://support.pepipost.com/help_center
Pro Deliverability and strategic consulting
Inline with the philosophy, Pepipost offers deliverability and strategic consulting to clients to help them make most of their marketing investment.
Pro Pay only for emails that are not opened
While other services make you pay for each email sent, Pepipost's philosophy is that email conversations should be free regardless, this way the pricing model is built around paying for emails that are not open. So it's up to you to make quality emails and make as much users as possible to open them in order to pay less.
Con Slow to approve an account
It seems an option for Mandrill, but "Pepipost" is slow with support as you may have to wait a while for an account to be approved.
Con Unpredictable price
Because of Pepipost's billing plans, it's very hard to predict costs. You never know how many users will open your emails any given time and if a lot of them end up not opening them (which most of the time is true) the price can get really high.