How to Use the Mailsac MCP in Claude

Q: How does Mailsac handle custom domains inside Claude Desktop?

Your agent calls listcustomdomains to pull your verified domains directly into the chat context. From there, you can instruct Claude Desktop to reserve addresses on your own domains rather than the public pool.

Q: Can I search for old test emails using Mailsac on Claude Desktop?

Yes, if you use a paid tier. Your agent runs searchaccountmessages to query subjects or senders across your entire history.

Q: What is the easiest way to delete messages using Mailsac and Claude Desktop?

You tell the agent to delete a message, and it triggers deleteinboxmessage with the target ID. It clears the mail server instantly.

Spin up disposable email inboxes and verify message payloads directly inside Claude Desktop.

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Create your Vinkius account to connect Mailsac to Claude Desktop 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 Claude Desktop

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Setup instant disposable addresses with Claude Desktop

This MCP Server manages disposable email addresses directly from Claude Desktop. Stop setting up dummy email accounts manually for integration testing. By calling `reserve_new_address`, Claude Desktop claims dedicated addresses on the fly, saving you from navigating UI dashboards just to get a clean inbox.

Read and parse incoming payloads in chat

This MCP Server extracts raw email bodies and text payloads directly into Claude Desktop. Stop copying raw email headers into your chat window. Your agent runs `get_plain_text_body` to extract verification codes or activation links from incoming emails. If you need to check layout structure, the agent fetches the HTML payload using `get_html_message_body` to read raw formatting.

Manage test inboxes directly from the prompt

This MCP Server handles inbox cleanup and message deletion directly inside Claude Desktop. Clean up your test runs without leaving the desktop interface. Your agent keeps your workspace tidy by calling `delete_inbox_message` right after extracting your test tokens. Finding specific verification runs is straightforward because the agent runs `list_inbox_messages` to see what arrived, or executes `search_account_messages` to locate old validation runs.

Setup guide

Set up Mailsac MCP in Claude Web or Desktop

1

Open Claude Settings

Go to claude.ai, click your profile icon, then navigate to Customize → Connectors.
2

Add Custom Connector

Click the "+" button and select Add custom connector. Paste your Vinkius endpoint URL: https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com. For OAuth-protected servers, expand Advanced settings to add credentials.
3

Start a conversation

Open a new chat. The Mailsac MCP tools are available immediately — no restart needed.

Endpoint URL

https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp

No configuration file needed — paste the URL directly in the Claude web interface.

Available on Free (1 connector), Pro, Max, Team, and Enterprise plans.

Prerequisites

Claude Desktop installed (macOS or Windows)
Active Vinkius subscription with a valid endpoint token

1

Open Claude Desktop Settings

Click the menu icon at the top-left corner, go to Settings → Developer → Edit Config. This opens claude_desktop_config.json in your default text editor.
2

Paste the Mailsac MCP configuration

Copy the JSON snippet on the right into the mcpServers object. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com.
3

Restart Claude Desktop

Close and reopen the application. Claude needs a full restart to load new MCPs — refreshing a conversation is not enough.
4

Verify the connection

Open a new conversation. Click the 🔌 icon at the bottom of the message input. You should see tools listed under mailsac-mcp.

json

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

Get your connection token →

Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by Mailsac. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

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Common questions about Mailsac MCP in Claude Desktop

Your agent calls `list_custom_domains` to pull your verified domains directly into the chat context. From there, you can instruct Claude Desktop to reserve addresses on your own domains rather than the public pool.

Yes, if you use a paid tier. Your agent runs `search_account_messages` to query subjects or senders across your entire history.

You tell the agent to delete a message, and it triggers `delete_inbox_message` with the target ID. It clears the mail server instantly.

No. The MCP Server connects directly to the cloud-hosted REST API. All email routing and hosting occur on their infrastructure.

All raw email bodies and messages pass through the V8 Isolate Sandbox. This MCP Server ensures your transient testing data never touches persistent local logs or unauthorized external networks.

Use it with your favorite AI tools

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

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