This may seem an awfully trivial question, but its one that's been bugging me enough to ask it here.
I've developing (in the final stages before initial release) a web application service to sell to businesses (SaaS I believe they call it), and I have both a company and product domains set up with rudimentary pages up there currently.
However with email I've only set up addresses through the company domain, so we've got an email account each along with a more general contact and admin aliases set up on the company domain.
Now how important is it to have email addresses such as sales, support, etc on the product domain, as I could just create them on the company domain and be done with it.
Additionally if I set up these addresses on the product domain, how important is it to also have the replies to incoming emails be from the same product domain, rather than the company domain?