How to Use the Mailsac MCP in Cursor

Q: Can I use Mailsac to mock user registrations in Cursor?

Yes. Cursor runs reservenewaddress to create a unique inbox, registers the user, and then reads the incoming mail using listinboxmessages to complete the flow.

Q: How does Mailsac assist with debugging broken HTML emails in Cursor?

Your agent pulls the raw payload via gethtmlmessagebody directly into your editor. You can inspect the structural code side-by-side with your rendering templates.

Q: How do I clean up my test addresses after a coding session?

You ask the editor to release them. It triggers releasereservedaddress for each temporary inbox to keep your account clean.

Generate test code in Cursor using live API data from disposable Mailsac email inboxes.

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Connect Mailsac MCP to Cursor

Create your Vinkius account to connect Mailsac to Cursor and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup Mailsac with Cursor

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Write integration tests in Cursor using real email data

This MCP Server reads live email messages directly into Cursor during development. Stop writing tests against hardcoded mock email payloads. Cursor calls `list_inbox_messages` to pull real API responses into your active file. Your agent writes assertions based on actual network responses, reading the output of `get_plain_text_body` to write precise regex patterns for magic links.

Automated domain management during code generation

This MCP Server manages custom domains and addresses from your Cursor workspace. Keep your test domains organized while you refactor your codebase. The agent runs `list_custom_domains` to match your local environment variables with active remote domains. When you need a dedicated endpoint for a specific test suite, Cursor uses `reserve_new_address` to secure it.

Clear test environments using Cursor agent commands

This MCP Server automates mailbox teardown and cleanup inside Cursor. Do not let old test runs break your local assertions. Your agent executes `release_reserved_address` to tear down temporary routes as soon as your local test suite passes. For individual message cleanup, the editor triggers `delete_inbox_message` on demand.

Setup guide

Set up Mailsac MCP in Cursor

Prerequisites

Cursor installed (macOS, Windows, or Linux)
Active Vinkius subscription with a valid endpoint token

1

Open MCP Settings

Go to Cursor Settings → MCP or open the Command Palette (Cmd+Shift+P / Ctrl+Shift+P) and search for "MCP: Add Server".
2

Add the Mailsac MCP

Cursor will create or open .cursor/mcp.json in your project root. Paste the JSON snippet on the right. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com.
3

Enable Agent mode

Open Composer (Cmd+I / Ctrl+I) and switch to Agent mode using the dropdown at the top. MCP tools are only available in Agent mode.
4

Verify the connection

Ask Cursor something like "List my recent Mailsac transactions." If the MCP tools are loaded correctly, Cursor will call the Mailsac tools automatically. You can also check Settings → MCP for a green status indicator.

.cursor/mcp.json

{
  "mcpServers": {
    "mailsac-mcp": {
      "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    }
  }
}

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Common questions about Mailsac MCP in Cursor

Yes. Cursor runs `reserve_new_address` to create a unique inbox, registers the user, and then reads the incoming mail using `list_inbox_messages` to complete the flow.

Your agent pulls the raw payload via `get_html_message_body` directly into your editor. You can inspect the structural code side-by-side with your rendering templates.

Most features work on the free tier. However, if you need to run `search_account_messages` across all custom domains, this MCP Server requires a paid plan.

You ask the editor to release them. It triggers `release_reserved_address` for each temporary inbox to keep your account clean.

They reside in transient memory during your active editor session. This MCP Server uses zero-trust ephemeral environments, meaning no email data is written to persistent third-party storage.

Use it with your favorite AI tools

Connect this server to Cursor, Claude, VS Code, and more.

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