Publication 417, Nonprofit USPS Marketing Mail Eligibility: Nonprofit and Other Qualified Organizations > 5 Cooperative Mailings > 5-2 Eligible Mailings
The cooperative mail rule generally applies to all mail entered as Nonprofit USPS Marketing Mail. However, effective November 13, 2003, the Postal Service adopted a limited exception to this policy for certain fundraising mail in order to assist nonprofit organizations obtain the monetary funding needed to support their programs. Mailings within the exception are not subject to the cooperative mail rule and are not denied entry at nonprofit prices under that provision, but remain subject to all other eligibility standards for Nonprofit USPS Marketing Mail.
Nonprofit USPS Marketing Mail is not subject to the cooperative mail rule if it meets each of the following criteria: