There is a moment in every mail-ballot election that nobody photographs.
A tray of ballot envelopes sits at a processing plant. Most will be delivered. Some will not — because the person named on the envelope moved to another state in 2021, or died in 2023, or never lived there at all. Those envelopes still go somewhere. An apartment building’s shared lobby. A rented mailbox. The hands of whoever took over the house.
Nobody counts those. There is no line item anywhere in American election administration for ballots mailed to addresses where the voter isn’t.
On August 21, 2026, the Postal Service quietly changed something that touches this problem directly. Almost every story about the new rule covered the political fight. Almost none looked at the technical requirement that matters most for your county’s voter roll.
Start with the duty, not the barcode
Before any of this makes sense, one thing has to be on the table: somebody is already legally required to be checking.
The National Voter Registration Act does not tell counties to sit and wait for news to arrive. It tells them to run a program:
“...each State shall ... conduct a general program that makes a reasonable effort to remove the names of ineligible voters from the official lists of eligible voters...” — 52 U.S.C. § 20507(a)(4)
And the Help America Vote Act adds the tempo — list maintenance performed “on a regular basis” through “[a] system of file maintenance” — 52 U.S.C. § 21083(a)(2)(A), (a)(4)(A).
A program. A system. On a regular basis. Congress is describing something that runs continuously. Not a cleanup before a big election. Not a response to a complaint.
And eligibility is not one question. It’s four, and every one of them can change without anyone telling the county: Is this person still alive? Are they a citizen? Do they still live in this jurisdiction? Are they disqualified under state law by a felony conviction or an adjudication of incapacity?
Notice that the address answers only one of those four. A perfectly deliverable address tells you nothing about whether a registrant is alive or a citizen. Anyone selling address verification as voter roll integrity is overselling it, and we won’t.
But hold on to the address anyway. It turns out to be the field that decides whether a county can check the other three — and that’s where this new rule quietly lands.
First, the honest status update
The Postal Service issued a final rule, effective August 21, 2026, adding Section 705.24 — “Ballot Mail for Federal Elections” — to the Domestic Mail Manual. It covers federal general, special, and runoff elections. It does not cover primaries, and it does not cover military and overseas ballots sent under UOCAVA.
And it is not operating right now.
Two federal courts in Massachusetts have injunctions in place — State of California v. Trump and League of Women Voters of Massachusetts v. Trump — and the Postal Service said so in the rule itself: it “will not take actions to implement the rule specifically for the 2026 election unless and until the government obtains relief from those injunctions.”
A real rule, on the books, currently blocked for November. We’re not going to pretend otherwise.
We’re writing about it anyway, because the principle inside it doesn’t depend on the litigation. A county should be able to prove that the address it mails a ballot to is a real, deliverable address — whether or not a court ever lets this rule run.
The one sentence that matters
Here is the requirement, in the rule’s own words. Outbound ballot envelopes must bear:
“the voter’s unique IMb, as created by the Authorized Ballot Mailer, with the Delivery Point ZIP Code embedded and a Federal Ballot Mail Service Type Identifier (STID).” — DMM 705.24.3.1(c)
The identical requirement applies to the return envelope — the one the voter mails back — at 705.24.3.2(c).
Two pieces of jargon, both simpler than they sound.
IMb is the Intelligent Mail barcode — the row of tall and short bars along the bottom of a business envelope. It carries 31 digits: who mailed it, what service they want, a serial number unique to that one piece, and, at the end, a routing code.
“Delivery Point ZIP Code” is that routing code at its longest: eleven digits. Your five-digit ZIP, plus the ZIP+4 that narrows it to a block face or a building, plus two final digits that identify one specific mailbox. Not your street. Not your building. Your door.
That’s the whole rule, for our purposes. Every federal ballot envelope, out and back, has to carry a barcode naming one specific mailbox in the United States.
Why an eleven-digit ZIP code is an address audit
Here’s the part that doesn’t get explained anywhere.
You cannot make up a Delivery Point ZIP Code. It isn’t a number an election office can type in. It has to be looked up — and the only way to look it up is to run the address through software the Postal Service has certified under a program called CASS, the Coding Accuracy Support System.
This is not our interpretation. It’s in the Postal Service’s own Official Election Mail guide, the one it sends to election officials every cycle:
“To obtain automation discounts, a Delivery-Point ZIP Code from CASS-certified (Coding Accuracy Support System) software is required.” — USPS Kit 600, Official Election Mail
CASS software does two jobs. It standardizes the address — rewriting it into the exact form the Postal Service recognizes. And it checks that form against Delivery Point Validation (DPV), the Postal Service’s file of every deliverable address in the country, to answer one question: is this a real place mail gets delivered to?
So a requirement to print an eleven-digit delivery point barcode is, functionally, a requirement to run every voter’s mailing address through an address check first.
That’s what we’ve been arguing for — not as a barcode standard, as a roll-integrity standard. It gives a county a documented, dated, machine-generated answer to a question most offices have never systematically asked: how many addresses on this roll are not deliverable addresses?
And the ballot can’t chase the voter
One more thing makes address quality matter more for ballots than for ordinary mail.
Most mail follows you. File a change of address, and the Postal Service forwards your bank statements to your new home for a year.
Ballots generally don’t work that way. Election mail is typically sent so an undeliverable ballot comes back to the election office rather than chasing the voter — that’s the point of the return endorsements in the Postal Service’s election mail guidance, and many states require it outright. A ballot is a legal instrument tied to a specific jurisdiction. Forwarding one to a voter who now lives two states away isn’t customer service; it’s a ballot delivered to someone no longer entitled to vote there.
Notice the asymmetry, because it’s the heart of this. Under the NVRA, the confirmation notice a county sends to a suspected mover must be forwardable — the law wants that notice to find the person. The ballot is not. It goes to the address on the roll, or it goes nowhere.
So the address has to be right the first time. There is no second chance built into the system.
The rural problem is real, and we’re not going to wave at it
Here is where honest advocates have to slow down.
Not every real home has a mailable address. Large parts of rural America — and many tribal communities — have physical locations the Postal Service does not deliver to. A house at the end of six miles of county road is a perfectly real residence and still not a delivery point. People there get their mail at a P.O. box, a cluster box miles away, or a relative’s address in town.
That is exactly why voter rolls carry a mailing address as a field separate from the residence address. The residence address establishes where you live, and therefore which ballot you get. The mailing address exists so election mail can reach you.
Being un-mailable does not make a voter ineligible. An advocate who treats a failed address check as evidence of fraud is doing the same sloppy thing we criticize in the old interstate matching programs — turning a data artifact into an accusation. A failed check is a question, not a verdict.
Commenters, including tribal advocates, pressed the Postal Service hard on this. Its answer is worth reading closely.
The escape hatch — and what it means for counties
Deep in the rule, discussing the free tool it offers small mailers, the Postal Service says this:
“Another change for Federal Ballot Mail in the IMsb Tool will allow election officials to generate a unique IMb even where the address cannot be verified using Delivery Point Verification (’DPV’). Although DPV helps to identify issues that may hinder delivery, this modification will reduce the chance of an administrative or technical issue that could prevent an election official from generating a unique IMb.”
Read that twice, because it cuts both ways.
The good half: the Postal Service solved the rural and tribal problem. No voter loses a ballot because a nonstandard address won’t validate. That’s the right call, and it answers the fairness objection squarely.
The half counties need to hear: the rule will accept a barcode for an address that failed the check. So the rule, by itself, will not clean anybody’s voter roll. The Postal Service says as much, twice:
“the Postal Service will not assess the accuracy of the address entered, such as to determine whether there is a Change of Address or whether the address is otherwise invalid.”
“The Postal Service does not have any legal responsibility for management of state voter rolls.” — DMM 705.24.6
That’s not shirking. That’s the Post Office correctly refusing a job Congress assigned to somebody else. Under the NVRA and HAVA, list maintenance has belonged to the states and their counties since 1993.
The rule hands counties a diagnostic and declines to read the results for them. The address check will happen. Somebody still has to look at what it says.
What this actually means for the voter rolls
Strip away the litigation and the acronyms and four things are left standing:
Every federal ballot address will get run through CASS. For the first time, counties will generate a systematic, dated record of which mailing addresses on their rolls are deliverable and which are not.
A failed check is a lead, not a removal. It’s the beginning of the NVRA’s notice-and-confirmation process — a forwardable notice, a response window, the statutory waiting period. It is never, by itself, grounds to strike a name.
The Postal Service will not do this for you. It said so twice, in the rule text and the preamble. The barcode gets generated either way.
Every ballot gets a serial number. A unique barcode out, a unique barcode back, and after Election Day each state receives a list of every voter it enrolled and the barcodes tied to them. That is reconcilable data — the thing post-election audits have never had.
Counties do not need a court to lift an injunction to start any of this. Running your roll through CASS is something you can do this month, for a fraction of what defending a records lawsuit costs.
🗳️ Take Action
You don’t need a barcode to ask a good question. You need a stamp and a statute.
Ask your county election office, in writing:
“Under Section 8(i) of the National Voter Registration Act, 52 U.S.C. § 20507(i), I request records sufficient to show whether this office standardizes and validates registrant mailing addresses using USPS CASS-certified software; the date of the most recent such processing; the number of registrations whose mailing address did not validate to a deliverable delivery point; and what action, if any, was taken on those registrations.”
Three outcomes, and every one tells you something:
They produce the records — good, now you know the number.
They’ve never run it — that absence is itself a finding, and it’s a public record.
They refuse — the NVRA carries a private right of action at 52 U.S.C. § 20510.
And check your own. If you’ve moved, or a parent has died and may still be listed, that’s a documentable finding in five minutes.
Visit TheElectorList.com to see what ELLY™ has found in your state, volunteer as a county reviewer, or get help drafting your request.
Coming Next
There’s a second half to this story, and it’s the part that explains why so many counties believe their rolls are clean when they aren’t.
That eleven-digit barcode requires the address to be standardized — rewritten into the Postal Service’s exact format. It turns out standardization isn’t just a mailing detail. It’s the thing that decides whether a county’s death-record checks, change-of-address checks, and cross-state comparisons return anything at all.
Next post: why “Saint Augustine” and “ST AUGUSTINE” are the same place to you and two different places to a computer — and why the fix belongs at the registration counter, not in a cleanup project two years later.
The Bottom Line
The Postal Service just told election officials, in effect: if you want us to carry a federal ballot, tell us exactly which mailbox it goes to.
That’s not a partisan demand. It’s the least you can ask of a system that mails legal instruments to millions of people and, in most places, has never checked whether the addresses are real.
A ballot is not a magazine. It doesn’t get forwarded, and it shouldn’t be delivered on a guess.
A ballot needs a real address. It’s remarkable that we needed a rule to say so.
If this explained something you’d been trying to put your finger on, share it — and then send the letter.
Sources
The rule
Ballot Mail for Federal Elections, final rule — USPS, 39 CFR Part 111, effective August 21, 2026 (FR Doc. 2026-17238; published August 26, 2026). New DMM 705.24: definitions at 24.1; envelope standards at 24.3.1 and 24.3.2; barcode responsibility at 24.3.3; Portal enrollment at 24.4.2; state-specific Participation Lists at 24.4.3; verification at 24.5; non-interference at 24.6.
Ballot Mail for Federal Elections, proposed rule — 91 Fed. Reg. 32915 (June 2, 2026)
Postal standards
Kit 600: Official Election Mail, 2026–2027 — USPS (”To obtain automation discounts, a Delivery-Point ZIP Code from CASS-certified (Coding Accuracy Support System) software is required.”)
Statutes
52 U.S.C. § 20507 — NVRA Section 8: (a)(4) removal mandate; (d)(2) forwardable confirmation notice; (i)(1) public records
52 U.S.C. § 20510 — private right of action
52 U.S.C. § 21083 — HAVA Section 303: statewide database and list maintenance
Litigation
State of California v. Trump, No. 26-cv-11581 (D. Mass. June 25, 2026)
League of Women Voters of Massachusetts v. Trump, No. 26-cv-11549 (D. Mass. Aug. 11, 2026)
USPS pushes final mail voting rule forward despite court injunctions blocking it — Democracy Docket
Extraordinary posting!