Which service allows for delivery of newsletters and catalogs at a lower postage rate?

The service that allows for the delivery of newsletters and catalogs at a lower postage rate is Periodicals. Periodicals are designed specifically for publications like newspapers, magazines, and other similar print media that are published on a regular basis. This classification offers a more affordable postage option to encourage the distribution of informational and promotional materials over time, making it an economical choice for businesses and organizations looking to send out newsletters and catalogs.

In contrast, Priority Mail is primarily used for expedited delivery, ensuring quicker shipping of items, while Standard Mail, which is now often referred to within the scope of Marketing Mail, is generally used for bulk marketing materials but does not specifically cater to periodical publications. Marketing Mail itself is a broader category that includes promotional mailings and advertisements but does not provide the same level of reduced rates for regularly published materials as Periodicals do. Therefore, the unique advantages offered by Periodicals make it the correct choice for delivering newsletters and catalogs.