Be careful with this. I once ordered something with Dell, and while their front-end system would accept my email address just fine, apparently one of their back

Be careful with this. I once ordered something with Dell, and while their front-end system would accept my email address just fine, apparently one of their back-end systems choked on it, and not only did my order get stuck in limbo somewhere, but their customer service agents also couldn't easily fix it for me since their systems weren't able to handle this properly either.