I would like to weigh in on this, and maybe get some feedback. I am a full service dnn hosting provider, I am hosting customer portals, each under its own domain.
It is very much in my interest and their interest that email originating from a portal - whether it be newletter, feedback, etc - are coming from an email address on that domain.
The fact that this functionality isn't in there already, and that there is some disagreement as to its importance, makes me wonder...Am I doing this wrong? Should I be setting up a dnn instance per customer? Is that what was the intent of the design? To give each domain their own instance of DNN, and let them reign over their portals?
The reason I am asking is because the system seems to be set up to allow me to configure sub portals, each with their own domain, and there are sites out there providing guidance as to how to add customer portals as sub portals - which I have followed.
The SMTP functionality seems to go against this, and is a deal breaker as far as hosting multiple customer web sites on a single DNN instance.
Looking forward to hearing more about this.