Publication 417, Nonprofit USPS Marketing Mail Eligibility: Nonprofit and Other Qualified Organizations > 3 Application for Authorization
A responsible official of the organization must apply for an authorization to mail at the Nonprofit USPS Marketing Mail (nonprofit) prices at each Post Office where the organization plans to enter mailings. The initial application for nonprofit authorization and any subsequent applications to mail at other Post Offices require specific forms and documentation, as we will discuss in this chapter.
Required documentation includes proof of the organization’s nonprofit status and evidence that the organization meets one of the qualifying categories.
Qualified political committees and voting registration officials are exempt from the requirement to document nonprofit status (see 3-1.5).