How to Use the Mailsac MCP in Windsurf

Q: How does Windsurf Cascade use Mailsac to test signup flows?

Cascade triggers your signup form, calls reservenewaddress to get a temporary email, and waits. It then runs listinboxmessages to find the confirmation email and extracts the link using getplaintextbody to finish the test.

Q: How do I configure the Mailsac MCP Server in my Windsurf workspace?

Open your mcpconfig.json file and add the server configuration under the mcpServers key. Once you hit refresh in the MCP panel, Cascade discovers the email management tools and begins using them.

Let Windsurf Cascade handle your email testing flows by chaining Mailsac address creation and message validation automatically.

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Setup Mailsac with Windsurf

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Automate Email Verification in Windsurf Cascade

Cascade handles the entire email verification loop without stopping to ask you for permission at every step. It spins up a temporary inbox, triggers your application's signup flow, and pulls the verification link directly from the incoming mail. Your agent calls `reserve_new_address` to secure a clean inbox, then monitors it using `list_inbox_messages` to catch the incoming mail. Once the message hits, Cascade extracts the raw content using `get_plain_text_body` to grab your confirmation token and complete the signup.

Manage Custom Domains and Reserved Addresses

Keep your testing environments clean by managing your dedicated domains and permanent testing mailboxes directly inside your workspace. Cascade chains these setup tasks together so you never have to leave your code editor to configure test accounts. The agent uses `list_custom_domains` to find your verified domains and reserves specific addresses using `reserve_new_address`. When your integration tests finish, Cascade automatically runs `release_reserved_address` to clean up your workspace and prevent address accumulation.

Deep Message Inspections with this MCP Server

Debug complex HTML emails and rich transactional templates without opening a web browser. This MCP Server lets your agent inspect message layouts and headers directly inside your active Windsurf editor panel. Cascade uses `get_html_message_body` to parse the exact layout of your transactional emails. If something fails, the agent runs `delete_inbox_message` to purge the failed test run's data and start fresh.

Setup guide

Set up Mailsac MCP in Windsurf

Prerequisites

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

1

Open MCP configuration

Click the Cascade assistant icon in the sidebar, then click the hammer icon (🔨) at the top of the panel. Select "Configure" to open ~/.codeium/windsurf/mcp_config.json.
2

Add the Mailsac MCP

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

Refresh MCPs

Go back to the hammer icon (🔨) in Cascade and click "Refresh". Windsurf will detect the new server. No full restart is needed — the connection is hot-reloaded.
4

Verify in Cascade

Start a new Cascade conversation and ask something like "Show my Mailsac payment history." If connected, Cascade will call the Mailsac tools directly. You will see a green dot next to the server name in the MCP panel.

mcp_config.json

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

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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 Windsurf

Cascade triggers your signup form, calls `reserve_new_address` to get a temporary email, and waits. It then runs `list_inbox_messages` to find the confirmation email and extracts the link using `get_plain_text_body` to finish the test.

Yes, Cascade handles the cleanup automatically after your tests run. It calls `delete_inbox_message` to wipe out individual messages and `release_reserved_address` to free up your test emails.

Yes, if you are on a paid tier, Cascade can search across your entire account. The agent uses `search_account_messages` with specific query parameters like sender or subject to locate messages instantly.

Open your mcp_config.json file and add the server configuration under the mcpServers key. Once you hit refresh in the MCP panel, Cascade discovers the email management tools and begins using them.

Your email messages and custom domains are protected because the server runs inside an ephemeral, zero-trust V8 sandbox. Your API key remains safe in your local configuration, meaning no raw inbox content ever leaks to external third-party hosts.

Use it with your favorite AI tools

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