Private beta — the Founding Post.
Certified mail costs $9.28 and a trip to the post office.
Postly posts documents to a permanent address — identity-anchored, receipted, and independently verifiable — for pennies.
The Number
Check a Postly Number before you post to it
Every Postly Number carries a checksum. Mistype one and it fails loudly — a bad Number is rejected, never quietly delivered somewhere else.
How it works
Post it once. Prove it forever.
The loop is the same whether you are sending one notice or ten thousand statements.
01Post an Envelope to a Number
An Envelope is one document plus its metadata. You address it to a Postly Number — a permanent address for an entity, not an inbox that changes when someone leaves.
02First-time Senders wait on the Front Porch
Anyone may post to a Number, but a Sender you have never accepted lands in quarantine. You accept once; after that the Connection is live and their Envelopes come straight in.
03Every action lands on the timeline
Posted, accepted, opened, approved, dispatched — each event appends to a per-Envelope, hash-chained log. Nothing is edited after the fact; there is no separate audit tab because the timeline is the audit log.
04Both sides hold a receipt
The Sender gets proof it went out. The receiver gets proof it arrived. Same facts, same chain — so a dispute starts from one record instead of two inboxes.
05Seal an evidence pack when you need it
A certificate plus a reproducible bundle computed over the hash chain — independently verifiable evidence of what was sent, to whom, and when. Hand it to anyone; they can check it without asking us.
The words, in plain English
- Postly Number
- A permanent document address for a business, like PSTLY-4012-8842.
- Mailroom
- Everything behind your Number — what you have posted and received.
- Postbox
- A purposed container with its own rules, like “Monthly Invoices”.
- Envelope
- One document, its metadata, and the facts we recorded about it.
- Front Porch
- Where a Sender you have never accepted waits until you say yes.
- Carrier
- A vetted service provider — print today, more later. Always optional.
Receivers
Free for receivers, always
Receiving needs no account and never costs anything. Nobody should have to pay to be sent something they did not ask for — which is exactly why it is safe to print your Postly Number on every invoice, contract, and notice you send.
No account required to receive
An Envelope posted to your Number reaches you whether or not you have signed up. Claim the Number when you are ready.
The Front Porch keeps it clean
Publishing your Number does not open a floodgate. Unknown Senders wait outside until you accept them.
The address outlives the inbox
People leave, domains change, email bounces. The Number stays the same and the record stays with it.
Preliminary notices
For the people whose deadlines are measured in days
Construction preliminary notices are the sharpest version of this problem: a statutory clock, a document that must reach a named party, and a filing cabinet full of green cards to prove it did.
The clock does not move
Miss the window and the lien right goes with it. What matters is not that you mailed it — it is that you can show what you sent and when.
The certified-mail math
$9.28 a piece, plus the drive, plus the counter, plus filing the return receipt somewhere you can find it in two years.
Prove it without the counter
Post the notice to the Number, keep the receipt and the hash-chained timeline, and seal an evidence pack if it is ever questioned.
Postly is in private beta.
The Founding Post is our first cohort — free for the whole beta, onboarded in order. Published plans are on the pricing page.