The documentation is not currently in the greatest state, from what I saw. There is literally nothing other than the default config for how to setup email / SMTP.
this was also on my list of questions... i've seen nothing and i need to point things to smtp2go.. but at the moment i think i'm going to hold off.. i don't have the time or resources to be an early adopter..
my experiment was largely a knee jerk reaction to things going on over at reddit..i think there are plenty more people more capable than i am of assisting in growing this environment.. once i can contribute by simply offering up compute i'll be back.. for now I'll have to enjoy from afar.