NP.
We get lots of big artwork attachments and I couldn't live with POP delivery so moved it SME to a cloud box and did it myself. That made huge difference and got ver people complaining emails weren't 'instant' (even though in reality there is no guarantee that they are)
JPP is right - looking at an instant chat solution like Rocketchat may be another way to do it - it really is pretty instant. They are really pretty cool and worth a look if you have not tried anything like it before. Lots of different authentication options, channels, livechat for websites etc etc etc
By all means ask me for a login to our Rocket instance I run and come and chat with us and have a look. (You can get my mail address from bugzilla - just drop me a line)