---
title: "What is presort mail?"
description: "Presorting groups mail by destination to USPS standards before entry, reducing postal sorting work and qualifying eligible mailings for lower postage rates."
canonical: https://trysincerely.com/glossary/presort
last_updated: 2026-08-25
---
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# What is presort mail?

> Presorting groups mail by destination to USPS standards before entry, reducing postal sorting work and qualifying eligible mailings for lower postage rates.

Source: https://trysincerely.com/glossary/presort

Presorting is the process of grouping mail by destination before it enters the USPS network. The mailing is organized to USPS standards by ZIP Code and finer destination groups, then prepared in the required trays, sacks, or containers. Because the mailer has already done part of the sorting work, eligible mail can qualify for lower postage rates.

Most businesses do not presort mail in their own office. A print vendor, mail service provider, or presort bureau usually runs the address file, sorts the records, prepares the containers, and submits the required mailing documentation.

## Why it matters

Presort is one of the main drivers of postage cost. How finely a mailing can be sorted depends on its destinations, volume, mail class, shape, and preparation. A dense mailing may place more pieces into finer groups than a list scattered across the country.

Presort also comes with address-quality rules. USPS [Move Update standards](https://pe.usps.com/text/dmm300/602.htm) apply to discounted First-Class Mail and USPS Marketing Mail, and [NCOA](https://trysincerely.com/glossary/ncoa) processing is a common way to update addresses before mailing. [CASS](https://trysincerely.com/glossary/cass) work standardizes address details and helps assign the routing information used in sorting.

Presort does not mean every piece travels together after entry. USPS equipment and transportation still route each piece toward its destination. Nor does presort guarantee delivery. An address can meet formatting rules and still belong to someone who moved.

Sincerely sends address-approved pieces through print vendors that handle the postal preparation for the chosen format and class.

## Example

A printer has 12,000 letters bound for addresses across several states. Its mailing software groups them by destination, produces the container labels and paperwork, and sends the prepared mail to USPS. The sender pays the applicable presorted rate instead of handing over 12,000 unsorted letters.

Presort trades careful preparation before entry for less work inside the postal network.

## Related questions

- [What determines direct mail postage rates?](https://trysincerely.com/glossary/postage-rates): Direct mail postage rates depend on mail class, shape, weight, presort depth, and where the mailing enters the USPS network.
- [What is a seed list in direct mail?](https://trysincerely.com/glossary/seed-mailing): A direct mail seed list adds controlled postal addresses to a real campaign so the sender can inspect what arrived, where it arrived, and when.
- [What is NCOA?](https://trysincerely.com/glossary/ncoa): NCOA (National Change of Address) is the USPS database of change-of-address filings, used to update mailing lists before mail goes out so pieces follow people who moved.
- [What is CASS?](https://trysincerely.com/glossary/cass): CASS is the USPS Coding Accuracy Support System, a certification for address-matching software. DPV checks delivery-point records; neither confirms who works there.

---

Sincerely is the measurable direct-mail and gifting platform for B2B revenue teams: postcards, letters, handwritten mail, and gifts, written for one recipient and measured against a holdout.

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