Privacy

This page covers postalref.com, Ask and the MCP server, which postalref runs. postalref is an unofficial reference to USPS rules and codes, and it isn't part of the United States Postal Service.

Write to support@postalref.com about anything on this page, or to have something deleted.

Cloudflare hosts postalref.com, so each request from your browser reaches Cloudflare first. A request carries your IP address, your browser's name and version, and the address it asks for. postalref can see these records at Cloudflare for about a month.

Requests to postalref's server, which answers Ask and the MCP server, also go into its logs at Cloudflare for 7 days.

Cloudflare Web Analytics counts page views with a script that Cloudflare adds to each page and serves from its own address. A count gives the page, the site you came from, your country and your browser, but not your IP address. It sets no cookies.

Cloudflare also asks your browser to tell it when a page fails to load. Everything else a page loads comes from postalref.com, so no company but Cloudflare learns of your visit.

Ask sends your question to OpenRouter, a service that passes it to one of the companies running the DeepSeek V4.1 Flash model. postalref tells OpenRouter to use only companies that don't collect what they receive, so none keeps your question to train a model.

postalref keeps each question and its answer on a page of its own, at an address such as postalref.com/ask/k2m9x4r7pq3z. Anyone with the address can read the page and ask more questions on it. postalref lists kept pages nowhere and tells search engines not to index them. Don't put anything private in a question.

A kept page stays until someone asks postalref to delete it. To have one deleted, write to support@postalref.com with its address. postalref deletes the page and takes its question off any kept page that links to it.

When a page's address holds a question, after /ask?q=, Cloudflare's records of that request hold it too.

To limit how many questions one person asks a day, Ask counts them under a digest of your IP address, not the address itself. It deletes a day's counts when the first question after midnight UTC arrives. To stop a burst, Cloudflare also counts each IP address's questions over the last minute.

An agent using postalref's MCP server sends it a tool's name and what to look up, such as a tracking number. postalref answers from them and doesn't store them. Its logs at Cloudflare keep each request's IP address, the name the agent's software gives and the session it belongs to, but not what it asked.

Mail to support@postalref.com passes through Cloudflare, which forwards it to postalref's inbox at Google. postalref keeps your message and your address there to answer you, and deletes them when you ask.

• Cloudflare hosts the site, the server and the kept pages. It sees every request, counts page views, receives reports of pages that fail to load and forwards email to postalref.
• OpenRouter and the company running the model receive each question asked through Ask.
• Google holds postalref's inbox, so it receives any email you send to postalref.

postalref sells nothing it receives, shares it with no one else and shows no ads. Cloudflare, OpenRouter and Google follow their own policies: Cloudflare's privacy policy, OpenRouter's and Google's.

• To have a kept page deleted, write to support@postalref.com with its address.
• To ask what postalref holds about you, write to the same address. With no accounts or cookies, postalref can find only what you point it to, such as a kept page's address or your email.
• postalref doesn't follow you across other sites, so a browser's Do Not Track setting changes nothing here.
• postalref isn't meant for children under 13 and doesn't knowingly collect anything from them.

postalref posts any change to this page here and updates the date at the top.