@Birillo, 

YES you can!   Off the top of my head, I can think of a few different ways.   First, check out the zapier integrations here:

https://zapier.com/apps/ninox/integrations

Next.. you can “roll your own” if you have a server where you can write  your own SMTP listener and use the Ninox REST/API.

Both require that you have a Ninox Cloud account

@Birillo, 

Wow.. google snuck this one by me..   

Looks like you will have to pay for a google business account for this to work. :( 

See http://zpr.io/gSfAr