How to Use the Mailsac MCP in Cline

Let Cline write your tests, run them, and verify real emails using Mailsac without ever leaving your VS Code sidebar.

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Connect Mailsac MCP to Cline

Create your Vinkius account to connect Mailsac to Cline 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 Cline

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End-to-End Email Testing with Cline

Cline builds your entire testing suite and verifies actual email delivery in one go. You tell the agent what to test, and it writes the code, runs the test script, and checks the inbox to confirm the application sent the correct message. The agent uses `list_inbox_messages` to check if your app successfully sent the email. It then reads the content with `get_plain_text_body` to verify that your password reset or activation link matches what your database generated.

Clean Up Disposable Inboxes via Cline

Avoid cluttering your test suite with stale data from previous runs. Cline manages the lifecycle of your test addresses directly, cleaning up after itself so your next testing run starts with a blank slate. Your agent calls `delete_inbox_message` to wipe specific messages immediately after reading them. For permanent setups, it uses `list_reserved_addresses` to audit what's active and runs `release_reserved_address` on any orphaned testing mailboxes.

Verify HTML Layouts Using this MCP Server

Prevent broken layouts and bad links from reaching your users. This MCP Server lets your agent inspect raw HTML payloads inside your VS Code workspace to check that your email templates render correctly. Cline invokes `get_html_message_body` to retrieve the sanitized HTML of any incoming mail. It then parses the DOM to ensure your CSS styles, images, and transactional buttons are structured properly.

Setup guide

Set up Mailsac MCP in Cline

Prerequisites

VS Code with Cline extension installed
Active Vinkius subscription with a valid endpoint token

1

Open Cline MCP settings

Click the Cline icon in the VS Code sidebar to open the Cline panel. Then click the MCP Servers icon (server stack) at the top-right corner of the panel.
2

Add a remote server

Click "Remote Servers" at the top, then click "Add Remote MCP". In the Name field, type mailsac-mcp. In the URL field, paste your Vinkius endpoint: https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp. Get your token from cloud.vinkius.com.
3

Enable the server

After saving, the server appears in the Cline MCP panel. Toggle the switch to enable it. The status indicator turns green when the connection is live.
4

Start using tools

Return to the Cline chat and ask: "Check my latest Mailsac refund status." Cline will discover the available tools and request your approval before invoking each one — giving you full control over every action.

Cline MCP Settings

{
  "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.

Why Choose Vinkius

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Common questions about Mailsac MCP in Cline

You simply ask Cline to verify an email sent to a specific address. The agent calls `list_inbox_messages` and parses the message body automatically to confirm your application's email reached the destination.

Yes, Cline can list and use your custom domains for test runs. It calls `list_custom_domains` to find your configured domains and then reserves test addresses using those domains.

If your account has search access, Cline can search across all your inbox addresses. The agent runs `search_account_messages` using parameters like subject or sender to find the exact email you need.

Click the MCP icon in the sidebar and add the server details under the Marketplace or Remote Servers tab. This writes the configuration directly to your cline_mcp_settings.json file so Cline can access the tools.

Yes, your inbox messages and API tokens are completely isolated. The server runs in a secure, local sandbox environment, ensuring that your private email content is never exposed to external servers.

Use it with your favorite AI tools

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