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A permit imprint is a printed marking that replaces postage stamps on bulk mail. Instead of sticking a stamp on each envelope, a mailer with a postal permit prints a small box in the upper right corner showing the mail class, the city and state of mailing, and a permit number. The post office deducts postage from the mailer's account.
You have almost certainly received mail carrying a permit imprint, even if you never noticed it. It looks like a small rectangular box where a stamp would normally sit, with lines of text inside rather than a picture. Charities, political campaigns, utilities, and catalog companies use them for large mailings, because sticking stamps on thousands of envelopes by hand is slow and expensive. The imprint does the same job as a stamp, just at scale.
A standard US permit imprint contains four elements: the words for the mail class (for example, Presorted Standard or First-Class Mail), the name of the city and state where the permit was issued, the permit number, and sometimes the name of the mailer. The box sits in the upper right corner, exactly where a stamp goes. Canada Post uses a similar system called an indicia, which works on the same principle: a printed marking that shows postage was paid through an account rather than with stamps.
One detail trips people up: the city printed in the imprint must match the city where the permit is held and where the mail is entered into the postal system. A company based in Chicago cannot use a Chicago permit imprint on mail it drops off in Dallas. That mismatch is one of the most common reasons a bulk mailing gets rejected at the counter.
The mailer applies for a permit at the post office where the mail will be entered, pays a permit fee, and sets up an advance deposit account. When a mailing is ready, the mailer brings the sorted, counted pieces to that post office along with a postage statement that lists the quantity and mail class. The clerk verifies the count and the sorting, then deducts the postage from the deposit account. No stamps change hands at any point.
Permits only make sense at volume. Bulk mail classes carry minimum piece counts, so a permit is a tool for organizations that mail hundreds or thousands of identical pieces, not for someone sending ten letters. The sorting matters too: permit mail generally has to be presorted by ZIP code, which is part of why bulk postage costs less than single-piece postage. The mailer does some of the post office's sorting work in advance, and the discount reflects that.
| Feature | Permit imprint | Regular stamp |
|---|---|---|
| Who uses it | Organizations mailing in bulk | Anyone mailing a single piece |
| How postage is paid | Deducted from a deposit account | Paid when the stamp is bought |
| Where it appears | Printed box, upper right corner | Stamp, upper right corner |
| Sorting required | Usually presorted by ZIP code | None |
| Minimum quantity | Bulk minimums apply | One piece |
No. A permit imprint is tied to a specific mail class and a specific permit. A mailer cannot use a marketing mail imprint on first-class letters, and cannot lend a permit to another organization. If a nonprofit lets a commercial business use its permit, that is a violation, and the post office can revoke the permit. Each mailing also has to match the class printed in the imprint: the contents, weight, and sorting all have to fit that class.
There is also a practical limit that surprises first-time bulk mailers. Permit mail cannot be dropped in a street mailbox. It has to be presented at the post office that holds the permit, with the paperwork, during business hours. Mailers who miss the daily cutoff wait until the next business day, which matters when a mailing is tied to an event date or a billing cycle.
LetterAgent is built for individual letters, not bulk mailings, so permit imprints do not apply to it. When you ask your AI assistant to send a letter through LetterAgent, the letter is printed and mailed as a single piece with standard postage, and the price you approve up front covers print, postage, and the service fee. If you are planning a bulk mailing of hundreds of identical pieces, a postal permit or a bulk mail house is the right tool, and this guide explains the marking you will see on that mail.
Ready to mail it? Send your letter with LetterAgent: describe it to your AI assistant, approve the exact quoted price, and it is printed and mailed.
LetterAgent is a working name. Prices include print, postage, and our service fee. US prices in USD, Canadian prices in CAD (Canadian prices exclude applicable sales tax, added at checkout). Currently in private testing.
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