LetterAgent
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Yes, but the mail won't find it until the address exists in the postal system. The municipality assigns the street address first, then the postal service adds it to its address database, which can take weeks. Until then, the surest route is General Delivery: address the letter to the recipient at the local post office, and they pick it up with ID.
| Stage | Who acts | What you can do |
|---|---|---|
| Address assigned, not yet in postal database | Builder and local government | Use General Delivery at the local post office |
| In database, no mailbox yet | Postal service | Mail works once a receptacle is in place |
| Mailbox installed, route active | Carrier | Mail normally, like any other address |
A house can be finished, sold, and lived in before the postal service knows it exists. The postal service doesn't learn about new addresses from building permits or move-in dates. It learns about them through its own address management process, which starts when the builder or developer formally submits the new addresses. Until that submission is verified and entered, the address is invisible to the sorting machines, and mail addressed to it gets flagged as undeliverable.
This is also why address lookup tools draw a blank. Online forms that validate addresses check against the postal database, so a brand-new address fails validation everywhere: shopping checkouts, government forms, and mailing services alike. The house is real; the database entry just hasn't caught up.
In the US, the chain runs through the USPS Address Management System. The local government assigns the street name and number, the builder provides the details to the local post office, and USPS verifies the address against its standards before adding it. Verification isn't instant: it can take weeks, and in fast-growing subdivisions where whole streets appear at once, longer. A mailbox or other approved receptacle also has to be in place before delivery starts, and in new subdivisions the developer often installs cluster boxes for the whole street at once.
In Canada, the equivalent process runs through Canada Post's address management, and new subdivisions typically get community mailboxes rather than door delivery. Either way, the pattern is the same: government assigns, postal service verifies, delivery follows.
General Delivery is the official workaround on both sides of the border. Address the letter to the recipient's name, add "General Delivery," then the post office's city, state or province, and ZIP or postal code. The letter waits at the counter, and the recipient picks it up with photo ID. Post offices hold General Delivery mail for a limited time, usually around 30 days, so don't let it sit.
A few practical tips for the gap period. First, confirm the exact official address with the recipient before mailing anything; builders sometimes change lot numbers late in construction. Second, know that couriers like UPS and FedEx may deliver to the new house before the postal service does, since they route by GPS rather than the postal database. Third, skip anything time-sensitive until delivery is confirmed working. A test letter is cheap insurance before you mail the important stuff.
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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