One click in Clio. Pick a service, confirm the address, pay per letter. Tracking number and proof of postage come back as a Note on the matter automatically. No subscription, no postage account top-ups, no per-firm setup.
The Custom Action button lives on every Matter screen. Open a matter, click the button, and PostBridge does the rest.
The button appears in the Custom Actions section of every Matter. We pre-fill the recipient from the Matter's contact and the latest document attached to the matter.
Choose 1st / 2nd / Signed For / Special Delivery. Adjust envelope size, simplex or duplex. Live preview shows what the envelope and first page will look like.
Stripe Checkout takes the per-letter charge. We print and post via a licensed UK print partner. The Matter Note logs the tracking number and proof of postage.
Same Royal Mail products you'd post over the counter, billed per letter. Prices below are for a 1-page B&W small letter (≤100g). Additional pages from £0.10. Color print available from £0.20 per page.
| Service | Aim | Tracked | Signature | From (1pp B&W) |
|---|---|---|---|---|
| Royal Mail 2nd Class | 2–3 working days | — | — | £1.15 |
| Royal Mail 1st Class | Next working day (aim) | — | — | £1.65 |
| 2nd Class Signed For | 2–3 working days | ✓ | ✓ | £3.15 |
| 1st Class Signed For | 1–2 working days | ✓ | ✓ | £3.60 |
| Special Delivery — by 1pm | Next working day, guaranteed | ✓ | ✓ | £8.00 |
| Special Delivery — by 9am | Next working day, guaranteed | ✓ | ✓ | £14.00 |
Prices in GBP, inclusive of VAT. Large Letter (C4) tier from £1.95 (2nd) / £2.60 (1st). See the pricing page for the full table.
Every design decision was made to remove a step. Nothing in your Clio workflow changes — we just hang off the matter you're already on.
We don't import contacts or documents into a separate system. PostBridge reads the matter live, sends the letter, and writes the result back as a Note.
No subscription, no postage account, no minimum spend. Stripe Checkout takes the charge at send time. The receipt links the matter and the letter ID.
For Signed For and Special Delivery, the Royal Mail tracking number lands as a Matter Note within seconds of dispatch. Audit trail without copy-paste.
OAuth tokens, webhook secrets, and personal data sit Fernet-encrypted. Webhook signature verify is constant-time. Disabled installs refuse to process any request — including events.
A UK address ships via Royal Mail through a licensed UK print partner — not from abroad. The letter looks and tracks exactly like one posted at the counter.
OAuth 2.0 install, two-step webhook handshake, HMAC verification, separate per-install deauthorize secret. The same plumbing PostBridge runs for direct API customers and ChatGPT integrations.
If yours isn't here, email agent@postbridge.ai — we aim to reply within one business day.
No. The return address on the envelope is yours (your firm's address, configurable per install). The letter arrives via Royal Mail like any other piece of post. The only mention of PostBridge is on your Stripe receipt and the matter Note.
It places a button labelled "Send Royal Mail via PostBridge" on the Matter screen. When you click it, Clio passes the matter context (matter ID, your user ID, a one-time nonce) to PostBridge over HTTPS. PostBridge reads the matter and its latest document, then renders the send form. We never store your Clio password — the install uses OAuth 2.0 like every other Clio integration.
The send form is editable. Anything you type into it overrides the contact's stored address for this letter only. We do not write changes back to the Clio contact — the matter remains the source of truth and your edits stay scoped to the one send.
Any PDF attached to the matter. The form defaults to the most recent document and lets you pick a different one. We pre-flight that the document is fully uploaded to Clio before charging.
Uninstalling immediately revokes our OAuth access — Clio fires a deauthorize callback that flips the install to disabled within seconds. Orders already placed continue to fulfil. The encrypted access token, refresh token, and webhook secret are retained for 180 days then purged. Order records (matter ID, recipient address, service, charge) are retained 7 years per UK tax law. See the privacy policy for the full breakdown.
At launch, yes — UK destinations via Royal Mail. PostBridge as a platform supports US, France, Germany, and Canada too; the Clio integration starts UK-only because that's where we have the deepest Royal Mail product coverage. Add another jurisdiction by emailing agent@postbridge.ai.
Email agent@postbridge.ai with the matter ID and (if applicable) the PostBridge order ID from the matter Note. We acknowledge within one business day. For incidents affecting active letters, we respond same-day on UK business hours.
Free to install. Pay only when you send a letter. Uninstall anytime — disables within seconds.
Install for Clio