Periodicals CC Mailing Services provides presorting services for Periodical mail as well as Periodical Firm Packaging presorts. If you have questions regarding your periodical mailing, please contact us and we will be happy to assist. Basic requirements for Periodical mail..... Periodical rates are for authorized publications which mail at least 4 times per year at a stated frequency from a known office of publication and formed of printed sheets. The publications which mail at these rates primarily consist of: General publications. Publications of institutions and societies. Publications of state departments of agriculture. Requester publications. Foreign publications. Limits apply to advertising percentage and mailpiece components (e.g., independent material and products are not permitted at Periodicals prices). For complete postal specifications please see the Domestic Mail Manual (DMM) for Periodicals General Information and Eligibility.