I like that it's very customizable so you can personalize your inbox as much if not more than other providers do! You get to choose what types messages are sent from within each category which makes for an extremely useful tool when trying figure things such us spam filters etc., We've been able t o send emails internally through our own address easily since we have this set up now too!! Nothing really but just be sure yo uhave everything ready before getting started because there will surely come times where something might go wrong during setup process -.- Just make backups first then try again once done :).