The best thing about this service is that it works like an app which makes your emails super easy to manage from anywhere! I have no complaints at all with run box as far sending or receiving messages are concerned but i do dislike how sometimes there could be some delay in delivering my mails (especially when its urgent) - not sure if thats something they can fix though? so overall great product!! highly recommended! use them :).
Sending bulk of Emails-easy management through their mobile apps etc.-secure connection/encryption using SSL certificates.