# Synthetic letter and postcard: source to final proof

Checked October 12, 2026 through **Postedly Reviewer MCP in Codex**. These are fictional documents for inspecting file transfer, quoting and final-proof generation. No order was approved or created; no payment, postal dispatch or delivery occurred.

The welcome letter contains the finished message, rather than instructions to write a letter. The postcard contains final front-and-back artwork. People and the Cedar Grove Walking Club are fictional. The proofs use fictional names at public San Francisco civic institutions; nothing was mailed to those addresses. The source artwork visibly identifies itself as synthetic and not mailed.

## Inspect the exact files

| Sample | Exact source | Rendered source | Actual final proof |
| --- | --- | --- | --- |
| Welcome letter | [One-page PDF](https://postedly.com/examples/synthetic-welcome-letter.pdf), 8.5 × 11 inches | [Letter page](https://postedly.com/examples/synthetic-welcome-letter.png) | [Two-page PDF](https://postedly.com/examples/synthetic-welcome-letter-final-proof.pdf): added address sheet, then source letter |
| Postcard | [Two-page PDF](https://postedly.com/examples/synthetic-postcard.pdf), 6.25 × 4.25 inches per page | [Front](https://postedly.com/examples/synthetic-postcard-front.png) · [Back](https://postedly.com/examples/synthetic-postcard-back.png) | [Two-page PDF](https://postedly.com/examples/synthetic-postcard-final-proof.pdf): front and back with postal address placement |

All source and final-proof pages were rendered and visually inspected. No added Postedly branding, clipped text or overlapping content was observed. The final proofs above are the actual PDFs returned by the unpaid quote flow, not illustrations of a future result. They establish proof generation only; they are not printed specimens or delivery evidence.

## Observed quote result

Each quote returned **$9.99 USD**, consisting of a $9.99 service line and $0 sales tax for the test details. Both had no address warnings. These dated quotes expire and are not an offer for another recipient, document or future send. Request a new quote for the exact order you intend to approve.

The [sanitized test receipt](https://postedly.com/examples/synthetic-unpaid-mcp-review.json) records the observed date, client, production version, source and proof SHA-256 hashes, page counts, exact totals and limitations. It intentionally excludes account email, document/quote/order identifiers, credentials and private review or proof URLs.

## Reproduce the source artwork

Download [generate-discovery-samples.py](https://postedly.com/examples/generate-discovery-samples.py) and run it in Python 3 with ReportLab installed:

```sh
python3 generate-discovery-samples.py
```

It writes the two source PDFs beside the script. It makes no network requests and creates no quotes, checkout sessions or orders. The generator uses deterministic PDF metadata and fictional text. The test receipt supplies the expected source SHA-256 hashes. Render and inspect every page before uploading any document; a matching checksum verifies the bytes, not the intended content.

The postcard dimensions were checked against the [live catalog](https://postedly.com/api/catalog) on October 12, 2026: 6 × 4 inches after trim, 0.125 inch bleed on every edge, and a 6.25 × 4.25 inch PDF page. The back reserves the address and barcode areas shown in the [provider’s 6 × 4 template](https://pg-prod-bucket-1.s3.amazonaws.com/assets/postcard_guideline_6x4.pdf). Check the current template before preparing new artwork.

To repeat the unpaid preparation check, connect your own account, check the catalog, transfer the exact source bytes and request a quote with authorized test addresses. Inspect the server-returned final proof and total, then stop before approval and payment. A fresh final proof can differ in its address layout or PDF bytes; these saved proof hashes identify this dated observation, not a requirement for future quotes.

Do not substitute these examples for a person’s requested letter or postcard. For a real send, finish and inspect their intended content, confirm the exact recipient and return address, and obtain approval for that final proof and total before payment.

[MCP setup and API examples](https://postedly.com/developers) · [Mail letters and postcards with an AI agent](https://postedly.com/guides/send-physical-mail-with-ai) · [Postcard requirements](https://postedly.com/services/postcards) · [Agent file-transfer guide](https://postedly.com/agent-guide.md)