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DocuPost MCP server

3 operations0 webhooks

Mail API for sending letters and postcards and checking the account balance.

Use DocuPost in Claude, ChatGPT, Cursor or another MCP client

Connect DocuPost once in Corsair, then add one MCP address to your agent.

Connect DocuPost
Setup steps for Claude, ChatGPT, Cursor and Claude Code

Building your own app on the Corsair SDK? Get API keys

Try DocuPost with your agent

Connect DocuPost, then paste this into Claude, ChatGPT or Cursor. For ideas from other apps, see the use cases.

Using Corsair, show me what you can do in DocuPost on my account, then run one read-only example and show me the result.

Runs once, when you ask

DocuPost tools and triggers

Tools are what your agent can do in DocuPost through Corsair's MCP server. Triggers are the DocuPost events a routine can start from.

Send

  • LetterWrite

    Send a physical letter through DocuPost

    send.letter

  • PostcardWrite

    Send a physical postcard through DocuPost

    send.postcard

Account

  • BalanceRead-only

    Fetch the remaining DocuPost account balance

    account.balance

Connect DocuPost to Claude, ChatGPT or Cursor

  1. 1

    Connect DocuPost in Corsair

    Add your DocuPost API key once in Corsair. Corsair stores the credential encrypted and makes the DocuPost API calls for your agent, so it never goes into a prompt or a config file. Connect DocuPost

    If your link lets the agent add apps, you can skip this: it gives you a sign-in link the first time it needs DocuPost. On a ChatGPT personal plan, connect DocuPost here first.

  2. 2

    Add Corsair's MCP server to your agent

    Every client uses the same address:

    https://mcp.corsair.dev/mcp
    Open Customize → Connectors → Add custom connector, paste the address, then select Connect.

    Codex, Gemini CLI, VS Code, Zed and other clients with OAuth sign-in work the same way. Clients without it, such as GitHub Copilot's coding agent, use a link's own address and an API key. Setup for every client

  3. 3

    Sign in and choose what needs your approval

    Your client opens Corsair to sign in. Pick a link: the apps your agent can use and a mode that decides what it may do without asking. None of DocuPost's operations are destructive, so in the default Cautious mode they all run right away. Strict mode asks before each of its 2 writes, and Read mode allows reads only.

FAQ

Install corsair and @corsair-dev/docupost, add the DocuPost plugin, and connect with an API key. Then call methods like corsair.docupost.api.account.balance() from your app. Corsair keeps each tenant isolated.

Yes. DocuPost requires an API key from your DocuPost account or developer dashboard. Create credentials with access that matches what you automate, then paste them into Corsair or connect through managed auth in Hub.

Yes. One Corsair client can hit DocuPost, GitHub, Notion, Stripe, and the rest. Trigger DocuPost from a webhook, push updates to Slack, or chain actions across plugins. Same tenant context across integrations, plain TypeScript.

Teams use Corsair for mail api for sending letters and postcards and checking the account balance. Common builds include sync jobs, admin tooling, and agents that call DocuPost APIs from your backend.

The SDK is open source. Self-host and you pay Corsair nothing for the integration layer. Hub bills for hosted auth and execution, not per DocuPost API call. Hub has a generous free tier. For hobby projects you can probably run the whole thing on free. Paid plans start to matter with more tenants or heavier traffic.

We maintain @corsair-dev/docupost in the open repo. When DocuPost ships API changes, upgrade the package. Your call sites stay typed. You should not need to rewrite the integration layer each time.

No. Corsair does not read your DocuPost data or hold individual access credentials. Credentials stay in your database. API calls run on your instance. We do not store DocuPost data on your behalf.

Yes. Add https://mcp.corsair.dev/mcp as a custom connector or MCP server in Claude, ChatGPT, Cursor, VS Code, Claude Code, Codex or any client that supports remote MCP servers with OAuth sign-in, then sign in to Corsair. On ChatGPT personal plans, custom servers currently get read tools only.

Yes. Put DocuPost on a link in Strict mode and every write waits for your approval, while destructive actions are refused. None of the DocuPost operations are destructive, so the default Cautious mode runs them all without asking. You can change a link's mode at hub.corsair.dev/me.