--- title: Understand benefits of pre-sorting mail description: general --- [Skip to content](https://info.certificateofservice.com/knowledge/understand-benefits-of-pre-sorting-mail#main-content) [![COS\_Primary Logo - Full Color](https://info.certificateofservice.com/hs-fs/hubfs/COS_Primary%20Logo%20-%20Full%20Color.png?width=200&height=200&name=COS_Primary%20Logo%20-%20Full%20Color.png)](https://certificateofservice.com) Open main navigation Close main navigation - Contact us Contact us How can we help you? Let's transform your noticing process today. - There are no suggestions because the search field is empty. 1. [Certificate of Service Knowledge Base](https://info.certificateofservice.com/knowledge?hsLang=en) 2. [Mailing](https://info.certificateofservice.com/knowledge/mailing?hsLang=en) # Understand benefits of pre-sorting mail ## Certificate of Service pre-sorts mail on site using a USPS sorter for all mail up to 9x12 envelopes. This benefits your mailings in the following way.   **Faster Delivery** Pre-sorting mail on site allows it to move through the USPS mailstream more efficiently, resulting in faster delivery to recipients. **Postage Discount** Because we pre-sort mail on site, we are also able to offer a discount on postage down to the meter rate. See ["Reducing Postage Rate with the Postal Acknowledgment Form"](https://info.certificateofservice.com/knowledge/reduce-postage-rate-with-postal-acknowledge-form-paf?hsLang=en) for how to qualify for this discount. **Notes** - Pre-sorting applies to all mail up to 9x12 envelopes. - If you have questions about how pre-sorting applies to a specific job, contact your COS representative. [![COS\_Primary Logo - Full Color](https://info.certificateofservice.com/hs-fs/hubfs/COS_Primary%20Logo%20-%20Full%20Color.png?width=200&height=200&name=COS_Primary%20Logo%20-%20Full%20Color.png "COS_Primary Logo - Full Color")](https://certificateofservice.com) [mailto:email@email.com](mailto:email@email.com) Copyright © 2025, certificateofservice.com