Inbox Messenger Raises $3.9 Million in Seed Round Funding. Inbox Messenger, a design-centric messaging app that makes conversation personal again, announced today that it has completed a $3.9 million seed round funding from a group of angel investors. Inbox Messenger will leverage funding to grow engineering and product teams to focus on enhancing its real-timeRead MoreThe post Inbox Messenger Raises $3.9 Million in Seed Round Funding. appeared first on Entrepreneur Sky | Startup & Tech News, Buzz, Tips.