What is an 'Enhanced' address in Mailsac?

An enhanced address is a private inbox that only you can access. Use the `reserve_new_address` tool to make an address private/enhanced.

Can I read the raw SMTP source of an email?

While this server provides tools for HTML and Plain Text bodies, the Mailsac API supports raw data retrieval. You can use the text body tool to extract key technical metadata.

Is an API Key required for all addresses?

Yes, this MCP server requires an API Key to interact with your account and access your reserved resources and private messages.

Mailsac MCP Server for Claude Desktop 9 tools — connect in under 2 minutes

Name: Mailsac
Availability: InStock
Author: Vinkius

modelcontextprotocol.io/quickstart/user

Built by Vinkius GDPR 9 Tools IDE

Claude Desktop is Anthropic's native application for interacting with Claude AI models on macOS and Windows. It was the first consumer application to ship with built-in MCP support, making it the reference implementation for the Model Context Protocol standard.

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Vinkius supports streamable HTTP and SSE.

RecommendedModern Approach — Zero Configuration

Vinkius Desktop App

The modern way to manage MCP Servers — no config files, no terminal commands. Install Mailsac and 2,500+ MCP Servers from a single visual interface.

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Classic Setup·json

{
  "mcpServers": {
    "mailsac": {
      // Your Vinkius token. get it at cloud.vinkius.com
      "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    }
  }
}

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High SecurityEnterprise-grade

IAMAccess control

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DLPData protection

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Ed25519Audit chain

<40msKill switch

Stream every event to Splunk, Datadog, or your own webhook in real-time

* Every MCP server runs on Vinkius-managed infrastructure inside AWS - a purpose-built runtime with per-request V8 isolates, Ed25519 signed audit chains, and sub-40ms cold starts optimized for native MCP execution. See our infrastructure

About Mailsac MCP Server

Connect your Mailsac account to any AI agent to automate your email testing and inbox management. This MCP server enables your agent to reserve private email addresses, retrieve and search for messages, and inspect HTML or plain text bodies directly from natural language interfaces.

Claude Desktop is the definitive way to connect Mailsac to your AI workflow. Add Vinkius Edge URL to your config, restart the app, and Claude immediately exposes all 9 tools in the chat interface. ask a question, Claude calls the right tool, and you see the answer. Zero code, zero context switching.

What you can do

Inbox Oversight — List and manage your reserved (enhanced) addresses and custom domains
Instant Retrieval — Fetch a list of messages received by any address in your account instantly
Content Extraction — Retrieve sanitized HTML or raw plain text bodies to extract verification codes or links
Inbox Maintenance — Permanently delete individual messages or clear entire inboxes via simple commands
Infrastructure Management — Reserve new private addresses programmatically for isolated testing flows
Global Search — Query messages across all your addresses using advanced search parameters (requires paid tier)

The Mailsac MCP Server exposes 9 tools through the Vinkius. Connect it to Claude Desktop in under two minutes — no API keys to rotate, no infrastructure to provision, no vendor lock-in. Your configuration, your data, your control.

How to Connect Mailsac to Claude Desktop via MCP

Follow these steps to integrate the Mailsac MCP Server with Claude Desktop.

Open Claude Desktop Settings

Go to Settings → Developer → Edit Config to open claude_desktop_config.json

Add the MCP Server

Paste the configuration above into the mcpServers section

Restart Claude Desktop

Close and reopen Claude Desktop to load the new server

Start using Mailsac

Look for the 🔌 icon in the chat. your 9 tools are now available

Why Use Claude Desktop with the Mailsac MCP Server

Claude Desktop by Anthropic provides unique advantages when paired with Mailsac through the Model Context Protocol.

Claude Desktop is the reference MCP client. it was designed alongside the protocol itself, ensuring the most complete and stable MCP implementation available

Zero-code configuration: add a server URL to a JSON file and Claude instantly discovers and exposes all available tools in the chat interface

Claude's extended thinking capability lets it reason through multi-step tool usage, chaining multiple API calls to answer complex questions

Enterprise-grade security with local config storage. your tokens never leave your machine, and connections go directly to Vinkius Edge network

Mailsac + Claude Desktop Use Cases

Practical scenarios where Claude Desktop combined with the Mailsac MCP Server delivers measurable value.

Interactive data exploration: ask Claude to query DNS records, look up WHOIS data, and cross-reference results in a single conversation

Ad-hoc security audits: type a domain name and let Claude enumerate subdomains, check DNS history, and flag configuration anomalies. all through natural language

Executive briefings: generate comprehensive domain intelligence reports by asking Claude to compile findings into a formatted summary

Learning and training: new team members can explore API capabilities conversationally without needing to read documentation

Mailsac MCP Tools for Claude Desktop (9)

These 9 tools become available when you connect Mailsac to Claude Desktop via MCP:

delete_inbox_message

Permanently remove a message from an inbox

get_html_message_body

Get the sanitized HTML body of a specific message

get_plain_text_body

Get the plain text body of a specific message

list_custom_domains

List custom domains linked to the account

list_inbox_messages

List messages in a specific inbox

list_reserved_addresses

List all reserved (enhanced) email addresses

release_reserved_address

Delete/Release a reserved email address

reserve_new_address

Reserve a specific email address

search_account_messages

Requires a paid Mailsac tier. Use query params like to, from, subject. Search for messages across all addresses

Example Prompts for Mailsac in Claude Desktop

Ready-to-use prompts you can give your Claude Desktop agent to start working with Mailsac immediately.

"List all my reserved email addresses in Mailsac."

"Fetch the plain text content of the last email sent to 'test-user@mailsac.com'."

"Reserve a new private address 'automation-flow@mailsac.com'."

Troubleshooting Mailsac MCP Server with Claude Desktop

Common issues when connecting Mailsac to Claude Desktop through the Vinkius, and how to resolve them.

Server not appearing after restart

Ensure the JSON is valid (no trailing commas). Check the file path: ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\\Claude\\ (Windows).

Authentication error

Verify your Vinkius token is correct. Go to cloud.vinkius.com to regenerate it if needed.

Tools not showing in chat

Click the 🔌 icon at the bottom of the chat input. If it shows 0 tools, the server may still be connecting. wait a few seconds.

Mailsac + Claude Desktop FAQ

Common questions about integrating Mailsac MCP Server with Claude Desktop.

How does Claude Desktop discover MCP tools?

When Claude Desktop starts, it reads the claude_desktop_config.json file and connects to each configured MCP server. It calls the tools/list endpoint to fetch the schema for every available tool, then surfaces them as clickable options in the chat interface via the 🔌 icon.

What happens if the MCP server is temporarily unavailable?

Claude Desktop handles disconnections gracefully. if the server is unreachable at startup, the tools simply won't appear. Once the server becomes available again, restarting Claude Desktop will re-establish the connection. There is no timeout penalty or error loop.

Can I connect multiple MCP servers simultaneously?

Yes. You can add as many servers as you need in the mcpServers section of the config file. Each server appears as a separate tool provider, and Claude can use tools from multiple servers in a single conversation turn.

Is there a limit on the number of tools per server?

Claude Desktop can handle hundreds of tools per server. However, for optimal LLM performance, Vinkius servers are designed to expose focused, well-documented tool sets rather than overwhelming the model with too many options.

Does Claude Desktop support Streamable HTTP transport?

Yes. Claude Desktop supports both SSE (Server-Sent Events) and the newer Streamable HTTP transport that Vinkius uses. Simply provide the server URL. Claude auto-negotiates the transport protocol.