On one of my projects, there is an internal messaging system between clients. It is important to note that 1) it is strictly internal communication with no external access 2) not everyone can communicate with everyone – there needs to be control over the accessible contact policies. Does anyone know if there are any global market services offering a ready-to-use integrated solution as a cloud service with an API for developers, including support and guarantees? Google does not fit because it is web-mail, which allows too much freedom for the specific task described above, and it cannot be limited.
Hi, I'm Rauf Aliev. 