How to Use the Mailsac MCP in VS Code Copilot

Q: How do we coordinate custom domains using Mailsac in VS Code Copilot?

Copilot reads your workspace configuration and runs listcustomdomains to fetch available domains. This allows the team to share a single pool of domains for testing.

Q: Can VS Code Copilot search historical emails using Mailsac?

Yes. Copilot runs searchaccountmessages to scan your account for specific headers, subject lines, or senders across all active addresses.

Q: How does Mailsac help VS Code Copilot verify HTML email layouts?

Copilot calls gethtmlmessagebody to fetch the raw markup. It then analyzes the code to check for broken links or missing image tags.

Verify transactional email delivery and parse raw payloads directly inside VS Code Copilot.

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Connect Mailsac MCP to VS Code Copilot

Create your Vinkius account to connect Mailsac to VS Code Copilot 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 VS Code Copilot

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Team-wide email testing with VS Code Copilot

This MCP Server exposes live inbox tools to your team inside VS Code Copilot. Share a unified testing configuration across your entire engineering team. Copilot calls `list_inbox_messages` to check incoming traffic on shared test domains. Developers do not need to share browser credentials to verify receipts because the agent runs `get_plain_text_body` to display verification codes in the chat panel.

Manage custom test domains in your editor

This MCP Server manages custom test domains directly within VS Code Copilot. Manage your custom testing domains without leaving your active workspace. VS Code Copilot executes `list_custom_domains` to verify which routes are available for your current branch. If you need a specific address for a QA run, Copilot triggers `reserve_new_address` to claim it.

Automated message cleanup for CI/CD runs

This MCP Server automates message deletion and mailbox cleanup in VS Code Copilot. Keep your shared mailboxes clear of noise during continuous integration runs. Your agent uses `delete_inbox_message` to purge incoming mail immediately after verification. When individual test endpoints are no longer needed, Copilot runs `release_reserved_address` to free them up.

Setup guide

Set up Mailsac MCP in VS Code Copilot

Prerequisites

VS Code 1.99 or later with GitHub Copilot extension
Active Vinkius subscription with a valid endpoint token

1

Open MCP configuration

Open the Command Palette (Cmd+Shift+P / Ctrl+Shift+P) and run "MCP: Add Server". Select HTTP (Streamable) as the server type. VS Code will create .vscode/mcp.json in your workspace.
2

Add the Mailsac MCP

Paste the JSON snippet shown on the right into your .vscode/mcp.json. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com.
3

Switch to Agent mode

Open Copilot Chat (Cmd+Shift+I / Ctrl+Shift+I) and switch to Agent mode using the dropdown. MCP tools are only available in Agent mode — they do not appear in Edit or Ask modes.
4

Verify the connection

In the Copilot Chat input, type # to list available tools. You should see the Mailsac tools listed. Try asking: "List my recent Mailsac transactions" and Copilot will invoke them automatically.

.vscode/mcp.json

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

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Common questions about Mailsac MCP in VS Code Copilot

Copilot reads your workspace configuration and runs `list_custom_domains` to fetch available domains. This allows the team to share a single pool of domains for testing.

Yes. Copilot runs `search_account_messages` to scan your account for specific headers, subject lines, or senders across all active addresses.

Copilot calls `get_html_message_body` to fetch the raw markup. It then analyzes the code to check for broken links or missing image tags.

No. The MCP Server configuration handles authentication at the workspace level, giving everyone access to the tools without manual setups.

All raw email bodies are routed through an ephemeral zero-trust gateway. This MCP Server decrypts your data on the fly for the active session and never stores it permanently.

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