USPS Marketing Mail is a discounted bulk mail class for advertising and promotional material such as flyers, catalogs, newsletters, and small parcels, with per-piece prices that start well below First-Class postage in exchange for slower delivery, a minimum of 200 pieces per mailing, a paid permit, presorting work, and the acceptance that undeliverable pieces are thrown away unless you pay for a return service. It’s the same service retailers, political campaigns, and nonprofits use to reach large audiences at a fraction of standard postage. The savings are real, and so is the preparation work most first-time mailers underestimate.1
What You Can Send
Marketing Mail covers mailable matter that doesn’t have to travel as First-Class Mail or Periodicals. In practice that means printed advertisements, flyers, circulars, catalogs, newsletters, and small parcels. Personal letters don’t qualify. You can print a recipient’s name and even personal details inside a piece, but only when that information directly supports the advertising or solicitation. A catalog showing your past purchases qualifies. A personal note slipped into the envelope does not, and USPS will require First-Class postage on the whole piece.
General mailability rules still apply. Hazardous materials, controlled substances, firearms, lottery-related items, and obscene content are nonmailable in any class.
Marketing Mail has extra content rules that trip up businesses. A piece that looks like a bill or invoice but is really a solicitation must carry a disclaimer in boldface capital letters at least 30-point type: “THIS IS NOT A BILL. THIS IS A SOLICITATION.” A piece that implies government endorsement must say “THIS IS NOT A GOVERNMENT DOCUMENT.” A facsimile check must state on its face that it has no cash value. Get any of this wrong and the entire mailing becomes nonmailable at the counter.
Volume and Size You Must Hit
Every mailing needs at least 200 pieces or 50 pounds of mail, and every piece within a single mailing must be the same class. There’s no upper limit. Every piece must weigh less than 16 ounces; at or above that, the piece moves to Parcel Select, Priority Mail, or another category.
Letter-size pieces have to fit within tight bounds to earn the lowest processing prices. Height runs from 3.5 to 6.125 inches, length from 5 to 11.5 inches, and thickness from 0.007 to 0.25 inches. The length divided by the height must fall between 1.3 and 2.5, which is why square envelopes fail and get surcharged or reclassified. Letters that miss machinable standards, including those over 3.5 ounces or with a non-paper exterior, pay a nonmachinable surcharge on top of the base rate.
Flats (large envelopes, useful for magazines and oversized catalogs) exceed letter dimensions on at least one side but stay within 12 inches high, 15 inches long, and 0.75 inches thick. Anything larger, or too rigid to bend, becomes a parcel and pays parcel postage.
What It Actually Costs
Four things drive the price: how deeply you presort, whether your pieces are automation-compatible, how close to the destination you drop them off, and whether you qualify for nonprofit rates.
Presorting means grouping your mail by ZIP Code before you hand it over. The deepest discount goes to Carrier Route mail (sorted down to individual carrier routes), then 5-Digit, 3-Digit, Area Distribution Center (ADC), and Mixed ADC. The gap is large. In 2026, a nonautomation Mixed ADC commercial letter costs $1.110 per piece with no entry discount, while a Carrier Route automation letter costs $0.244, roughly one-fifth the price. With DSCF destination entry, that Carrier Route automation letter falls further to $0.227.
Automation compatibility means your pieces carry Intelligent Mail barcodes (IMb) that USPS equipment can read. Without them, you pay nonautomation rates across every presort tier, and those are meaningfully higher.
Destination entry saves more on top. Dropping your mail at a Destination Sectional Center Facility (DSCF) or Destination Delivery Unit (DDU) skips transportation the postal service would otherwise perform. On 50,000 pieces, the $0.017 gap between the entry-discounted and non-discounted Carrier Route automation rate is $850.
Weight matters at one specific point. Pieces of 4 ounces or less pay a single per-piece price. Above 4 ounces, pricing becomes a per-piece charge plus a per-pound charge added together, so trimming a piece to stay under 4 ounces can produce real savings.
Authorized nonprofits pay substantially less across every category. For 2026 Carrier Route automation letters with no entry discount, the commercial rate is $0.244 and the nonprofit rate is $0.155, about 36% lower. At 5-Digit automation, the commercial rate is $0.365 and the nonprofit rate is $0.175, a gap of more than 50%.
On top of per-piece postage, the permit itself has fees. The permit imprint application fee is $370, and the annual mailing fee is another $370 per year, per permit, whether you mail once or fifty times.
Getting a Mailing Permit
You cannot mail at bulk rates without a permit. Start with PS Form 3615 (Mailing Permit Application and Customer Profile), which sets up your account with a business name, physical address, and contact person. You’ll pick a postage payment method: precanceled stamps, a postage meter, or permit imprints (indicia printed directly on the mailpiece). Permit imprints are the standard choice for high-volume mailers and require a funded trust account that USPS draws from with each mailing.
Nonprofit Authorization
Nonprofits qualify for the lower rates, but only after a separate approval. File PS Form 3624 with supporting documentation: articles of incorporation, an IRS tax-exempt status letter, or CPA-prepared financial statements substantiating nonprofit status. Submit to your local postmaster or Business Mail Entry Unit, or apply online through the USPS Business Customer Gateway. Hardcopy applications typically take about two weeks; online submissions can move faster.
Having 501(c)(3) status doesn’t guarantee approval. The organization must not be organized for profit, and no part of its net income can benefit any private individual or stockholder. USPS reviews each application on its own.
Preparing and Dropping Off a Mailing
Your address list has to have been updated within 95 days before the mailing date. This is the Move Update standard, and it’s mandatory. Approved methods include NCOALink (National Change of Address), Address Change Service (ACS), and ancillary service endorsements. Keep documentation for at least one year; USPS can request it, and failing the requirement triggers a surcharge.
Sorted mail goes into letter trays or flat trays. Letter trays get sleeved with a paperboard jacket and secured with a strap around the length. USPS doesn’t provide the strapping. Flats use lids you can get from your Business Mail Entry Unit. Some local post offices waive strapping for mailings that stay in the area, but ask your specific BMEU before assuming.
When the mailing is ready, bring it to a designated Bulk Mail Entry Unit with PS Form 3602-R (Postage Statement — USPS Marketing Mail). You can complete the statement on paper, submit it online through the USPS Postal Wizard, or transmit it electronically via PostalOne! using Mail.dat or Mail.XML files. A clerk verifies the piece count and total weight, checks the sort, and confirms the permit imprint. Discrepancies produce immediate cost adjustments. Payment comes from your permit account, and once the mailing passes it enters the distribution network.
Undeliverable Pieces Are Thrown Away
This is the rule people miss. By default, undeliverable Marketing Mail is discarded. It’s not returned, not forwarded, and USPS doesn’t notify you. Your postage is gone.
To change that outcome, print an ancillary service endorsement on the piece before mailing. Options include “Address Service Requested,” “Return Service Requested,” “Change Service Requested,” and “Forwarding Service Requested.” Each produces different handling (return, forward, or an electronic address correction) and each carries additional fees. If your address list is a business asset, the per-piece cost of an endorsement is usually worth paying to keep it clean.
When EDDM Is the Easier Path
If you want to reach every household on a mail route without maintaining an address list, Every Door Direct Mail (EDDM) is a lighter option. EDDM Retail needs no mailing permit. You use a USPS.com account, send between 200 and 5,000 pieces per day per ZIP Code, and pay online or at the post office. Instead of supplying addresses, you pick routes on a map, which removes the Move Update requirement and the list management entirely.
EDDM BMEU is the higher-volume version, runs through the standard bulk mail permit system, and has no per-day cap. Either version prices at Marketing Mail rates. The trade-off with EDDM is targeting: you’re mailing every address on a route, not a curated list. For a restaurant, real estate agent, or local campaign, that’s often the point.