How to have an agent mail payment reminders when email fails

Short answer

When an email reminder doesn't arrive or lands in spam, an agent can send the same message as a paper letter through the Postbot MCP server or REST API with no human involved. We print the letter and Česká pošta delivers it to the mailbox; registered letters come with a tracking number as proof of dispatch.

Steps

  1. Connect your agent to Postbot. Add the hosted MCP server (/mcp) to the agent as a remote tool, or use the REST API with an API key — no installation.
  2. The agent calls send_letter_cz as a fallback. After a failed email, it passes the address and reminder text and chooses registered so it has proof of dispatch.
  3. We print and mail the reminder. Česká pošta delivers it to the mailbox; the tracking number lets you follow delivery.

Frequently asked questions

When does mailing a reminder instead of emailing it make sense?

When email lands in spam, the recipient doesn't read it, or you need proof of dispatch — a paper letter with a tracking number covers what email can't.

Does the agent need credit up front?

The first letter can be sent without credit — an unfunded call returns a payment link for the exact amount. Repeat reminder sends need prepaid credit tied to the API key.

How does the agent know an email failed to deliver?

That's the agent's own logic (bounce, missing confirmation, timeout) — Postbot only accepts the command to mail a paper reminder as a fallback.

Can a reminder be sent with proof of delivery?

Yes — choose registered and you'll get a tracking number to follow delivery.