Publication 417, Nonprofit USPS Marketing Mail Eligibility: Nonprofit and Other Qualified Organizations > 4 Qualified Mailings
Authorization to mail at the Nonprofit USPS Marketing Mail (nonprofit) prices is a privilege granted by law only to authorized organizations. Civil and criminal penalties apply to false, fictitious, or fraudulent statements made in connection with a Nonprofit USPS Marketing Mail mailing. Under USPS standards, an authorized organization must do the following:
Note: The mailer’s signature on the postage statement certifies that the mailpiece is eligible for the nonprofit prices.