From a thoughtful draft to their mailbox.

Try a request like this.

Use this approved proposal to draft a one-page follow-up letter. Keep the scope and price unchanged and ask me about anything missing.

Choose your Claude workflow

1. In a Claude conversation, draft the letter and check its facts, tone, and recipient details. Copy the approved text or PDF into PostalMuse.
2. In an environment with authorized shell or HTTP tools, such as an appropriately configured coding-agent workflow, ask it to follow the PostalMuse REST quickstart. Keep credentials in the tool environment, not in the prompt.
3. Ask for the actual proof and exact quote. Use the customer review handoff when the API returns one, then approve the specific mailing.

Use this approved proposal to draft a one-page follow-up letter. Keep the scope and price unchanged and ask me about anything missing.

Use PostalMuse at https://postalmuse.com. Read https://postalmuse.com/skill.md and https://postalmuse.com/openapi.json if you can access them, and check https://postalmuse.com/v1/capabilities before attempting API preparation. First tell me whether this session can use an authorized browser or HTTP tool. If it cannot, help me prepare the text or PDF and direct me to https://postalmuse.com/compose; do not claim to have created a mailing. Ask for missing required details and use only the records I authorize. If live sending is unavailable, tell me and stop; do not substitute a simulated send. Show every proof page and the exact quote before requesting my approval. Do not pay or send without my explicit approval or an existing valid spending grant covering this mailing. Keep credentials private. Reuse the same idempotency key for retries and inspect the existing mailing if its outcome is uncertain.

What’s available today?

Claude’s custom connectors use MCP. PostalMuse currently exposes REST, not a hosted MCP connector, so entering the PostalMuse homepage as a connector URL will not install it. Platform-specific compatibility is not yet verified.

PostalMuse provides US 4×6 postcards and US Letter documents up to 20 source pages. No native scheduling, campaigns, international mail, or Certified Mail. An external scheduler or CRM remains outside PostalMuse.

Official Claude platform information →

Setup guidance reviewed September 25, 2026. This page is not an endorsement or official partnership.

You approve the mailing.

Creating a draft does not send it. Check both postcard sides or every letter page, confirm the addresses and exact price, then approve. If your agent cannot inspect the proof, review it yourself.