Free Certified Mail resources

References, tools and data about USPS Certified Mail that writers, lawyers, landlords, consumer sites and AI assistants can cite, link to or embed. USPS facts cite the Domestic Mail Manual; prices are current every time the page is read.

References

• USPS Certified Mail, fact by fact — what it is, what it costs, who signs, refused and unclaimed mail, PO Boxes, tracking, each fact with its own link and its USPS source. Includes Certified Mail and the alternatives, side by side.
• What Certified Mail proves, and what it does not — USPS mailing evidence versus evidence of what the document said, and the ways people prove contents, compared.
• Certified Mail cost in 2026 — every USPS fee, and the return receipts and services that add to it.
• How long Certified Mail takes — the USPS standard, the 15-day hold, and planning backwards from a deadline.
• Legal notices by Certified Mail — what Certified Mail satisfies and what it does not (notice is not service), with every letter type.
• Certified Mail records in court — what to bring, and what each record establishes.

Tools

• Certified Mail cost calculator — the USPS fees part by part and the all-in online price, for 1 to 10 pages.
• Certified Mail letter readiness checker — paste a letter and see what is unfinished, the page count and the price.
• Mailing record checklist — what to keep from any certified mailing.
• A sample mailing record — every piece of evidence kept for one letter, filled in.
• Embed the calculator or the checker on your site — one line of HTML each.

Data

piloxa.com/api/public/certified-mail returns the same facts as JSON: the services, today's prices for 1 to 10 pages, the USPS counter fees with their source, what the mailing record keeps, and the addresses of the tools for AI assistants. It describes the service only, never anyone's letters. For assistants and developers, how to connect an assistant and Piloxa for AI agents document the MCP connector and the OpenAPI description.

Citing these pages

Link to the page, or to the fact itself: every fact on the Certified Mail reference has a stable address, such as piloxa.com/certified-mail#certified-mail-cost or #proof-of-contents, and those addresses will not be renamed. When a USPS fee or rule changes, the page changes with it and says when it was last reviewed. Piloxa is a mailing and record-keeping service, not a law firm; nothing here is legal advice.

Related

• USPS Certified Mail, explained
• Legal notices by Certified Mail
• For AI agents
• For partners