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Mailgun MCP Integration for Codex

Connect Mailgun to Codex through the local KosmoKrator MCP gateway with scoped tools, credentials, and write policy.

7 functions 6 read 1 write API key auth
Submit Mailgun feedback View package source

Connect Mailgun to Codex

Use KosmoKrator as a local MCP proxy for Codex so coding sessions can reach selected integrations with explicit write policy.

Register kosmo mcp:serve as a local stdio server and choose the integration allowlist. The gateway is local, scoped to this integration, and starts with --write=deny so Codex can inspect read-capable tools without receiving write access by default.

Mailgun MCP Config for Codex

Keep write access denied or ask-based unless the workspace is trusted.

{
  "mcpServers": {
    "kosmokrator-mailgun": {
      "type": "stdio",
      "command": "kosmo",
      "args": [
        "mcp:serve",
        "--integration=mailgun",
        "--write=deny"
      ]
    }
  }
}

Run the Gateway Manually

kosmokrator mcp:serve --integration=mailgun --write=deny

Why Use KosmoKrator Here

Scoped tools

Expose only Mailgun instead of a broad multi-service tool list.

Local credentials

Reuse credentials already configured for the KosmoKrator CLI and Lua runtime.

Write policy

Start read-only, then opt into ask or allow for trusted workspaces.

Mailgun Tools Visible to Codex

Codex sees stable MCP tool names generated from the Mailgun integration catalog.

MCP toolSource functionTypeDescription
integration__mailgun__mailgun_get_current_user mailgun.mailgun_get_current_user Read Verify the Mailgun API connection and retrieve basic account info by listing domains.
integration__mailgun__mailgun_get_domain mailgun.mailgun_get_domain Read Get details and DNS records for a specific Mailgun domain.
integration__mailgun__mailgun_list_domains mailgun.mailgun_list_domains Read List all domains in your Mailgun account with optional pagination.
integration__mailgun__mailgun_list_messages mailgun.mailgun_list_messages Read List message events in your Mailgun domain with optional filtering and pagination.
integration__mailgun__mailgun_list_routes mailgun.mailgun_list_routes Read List all routes in your Mailgun account with optional pagination.
integration__mailgun__mailgun_list_webhooks mailgun.mailgun_list_webhooks Read List all webhooks configured for a Mailgun domain.
integration__mailgun__mailgun_send_email mailgun.mailgun_send_email Write Send an email via Mailgun. Specify from, to, subject, and text or HTML content.

Related Mailgun Pages

Mailgun CLIUse direct JSON commands instead of MCP discovery. Mailgun MCPFull gateway reference and MCP tool names. KosmoKrator for CodexClient-level gateway setup.