Legal entities like businesses, law firms, universities, non-profit organizations, hospitals, and government agencies, to name a few, should sign up by selecting "business use." However, even an individual who intends to use the same account for personal mail and to receive mail on behalf of a sole proprietorship or home-based business (where the company is analogous to the individual and has the same address) should sign up by listing both his or her business and personal names.

Individuals using the service only for themselves, or who sign up their families, will normally want to sign up for the personal service alone.