DNS & email auth
LiveSPF, DMARC, MX and DKIM lookups before a client domain goes live.
Ask whether a domain can receive mail and whether SPF and DMARC are set. Uses public resolvers; it does not send mail or change DNS.
Server URL
https://toolcargo.com/mcp/dns-emailClaude Code
claude mcp add --transport http --scope user toolcargo-dns-email https://toolcargo.com/mcp/dns-email \
--header "Authorization: Bearer YOUR_API_KEY"Create a key in your dashboard. Other clients: setup guides.
What it helps you do
- See MX and whether mail can be received
- Read SPF and DMARC policy
- Check a DKIM selector if you know it
Built for: Agencies launching or migrating client domains.
Example requests
Pre-launch mail
“Inspect DNS and email auth for client.com with ToolCargo, DKIM selector google.”
MX, SPF terminal policy, DMARC p=, and the google._domainkey TXT if present.
Step-by-step workflows: pre-launch check · fixing link previews
Tools
| Tool | What it does | Access |
|---|---|---|
inspect_dns_emailInspect DNS and email authentication | MX, A/AAAA, NS, SPF and DMARC for a public domain, plus an optional DKIM selector lookup. Public resolvers only. | Read-only |
Requirements
- • A ToolCargo account with Site Audit activated (free).
- • The domain must be publicly delegated.
Limitations
- • Does not send probe mail. Private/local hostnames are refused. DKIM needs the selector name.
Supported clients
“Tested” means we connected that client to this endpoint and ran a tool call ourselves. “Documented” means the client supports this setup per its own docs, but we have not tested it yet.
| Claude Code | API key header | Tested | Remote HTTP server with an Authorization header. Tested 2026-09-11 (v2.1.268). |
| Claude (claude.ai) | OAuth sign-in | Tested | Custom connector with OAuth sign-in; tested on claude.ai web 2026-09-11. Desktop and mobile use the same account connectors but were not tested separately. |
| Cursor | API key header | Documented, not yet tested | mcp.json with url and headers. |
| VS Code (Copilot agent mode) | API key header | Documented, not yet tested | .vscode/mcp.json with type http and headers. |
| ChatGPT (developer mode) | OAuth sign-in | Documented, not yet tested | Requires OAuth; API keys cannot be entered. |
| MCP Inspector | API key header | Tested | CLI mode, tested 2026-09-11. Useful for calling tools directly. |
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Pricing
Free
$0For trying the connector on your own sites.
50 calls/month · 25 links per check
Pro
$12/moFor freelancers and agencies auditing client sites every week.
2,000 calls/month · 100 links per check
Proposed test price. See the pricing page for checkout status.