Mail it,
from Muse.

Set up PostalMuse (https://postalmuse.com) so I can ask you to send US letters and postcards.

1. Read https://postalmuse.com/skill.md for authentication and the mailing workflow, and https://postalmuse.com/openapi.json for request and response schemas. API base: https://postalmuse.com/v1. Check https://postalmuse.com/v1/capabilities for current availability and limits.
2. If you can save reusable skills or instructions, save this as PostalMuse. Otherwise explain what you can retain. If you cannot call HTTP APIs, tell me and use https://postalmuse.com/compose as the browser handoff; do not claim a connector is installed.
3. Setup alone must not create a mailing, charge me, or send anything. When I ask to mail something, ask only for missing content, recipient and return address details. Use PostalMuse-issued sessions or scoped credentials; never ask me for Stripe, Lob, or card credentials.
4. Prepare a draft, inspect every proof page and the exact quote, then create a private review link with POST /drafts/{id}/review-links using the current revision, quote ID, manifest hash and maximum total. Give me the complete review_url so I can review and pay securely. Keep that link private.
5. Do not pay or send without my explicit approval or an existing valid spending grant covering this mailing. Reuse the same idempotency key when retrying an operation, and check existing status before retrying an uncertain send. A payment is not proof of delivery.
6. If live sending is unavailable, say so; do not substitute a simulated send. Finish setup by explaining what is ready and what is unavailable, then wait for my mailing request.