The Domain Mail Check MCP server,
connected in one click.
Check how a domain is set up for email and who it is registered with, from public DNS data. Connect the official Domain Mail Check MCP server to Claude, ChatGPT, or Cursor through gate — one gateway URL, no config files, security-checked.
Free to start · No credit card · No hosting needed
Add Domain Mail Check to your AI in one minute
Pick your client. Copy, paste, done — or let gate handle sign-ins and policies for you.
claude mcp add --transport http domain-mail-check https://mailcheck.openkrill.app/mcpRun in your terminal, then restart Claude Code.
Domain Mail Check · https://mailcheck.openkrill.app/mcp
What your AI can do with Domain Mail Check
Real prompts you can type the moment it's connected — no setup, no docs to read.
“Use “check_email_auth”: Use this when the user asks whether a domain's email is set up correctly, such as "is DMARC set up for github.com?" or "check SPF and DKIM f.”
“Use “check_dns_records”: Use this when the user asks for a domain's DNS records, its mail provider or which certificate authorities may issue for it, such as "which.”
“Use “lookup_domain_registration”: Use this when the user asks who a domain is registered with or when it expires, such as "when does openai.com expire and who is the registra.”
“Use “submit_feedback”: Send feedback to the maintainers about a missing tool, broken links, a bug, or stale data. Use this to send feedback, a bug report or a feat.”
How secure is the Domain Mail Check MCP server?
Every server in the gate directory has to pass the same four checks before your AI can touch it. Here's how Domain Mail Check holds up.
Official endpoint
Operated by Domain Mail Check (openkrill.app) at its documented MCP endpoint — not a third-party mirror or community re-host.
No sign-in needed
This server only exposes public data — no account and no credentials are involved when you connect.
Scanned before it goes live
gate checks every tool for prompt injection, hidden instructions, data-exfiltration hints, and over-broad permissions before the server is available through your gateway.
Watched for drift
If Domain Mail Check adds or changes tools later, gate re-scans and alerts you — before your AI acts on the change.
Connected in three steps
Connect your gate
Add one gateway URL to Claude, ChatGPT, or any MCP client. One-time setup, about two minutes.
Pick Domain Mail Check
Choose Domain Mail Check in the gate directory. No sign-in needed.
Use it anywhere
Domain Mail Check's tools are live in every AI client you've connected — with rules and logging built in.
Free to start · No credit card · No hosting needed
The actual tools Domain Mail Check exposes
Fetched live from the official endpoint and re-checked daily by gate — not marketing copy.
check_email_auth — Use this when the user asks whether a domain's email is set up correctly, such as "is DMARC set up for github.com?" or "check SPF and DKIM f
check_dns_records — Use this when the user asks for a domain's DNS records, its mail provider or which certificate authorities may issue for it, such as "which
lookup_domain_registration — Use this when the user asks who a domain is registered with or when it expires, such as "when does openai.com expire and who is the registra
submit_feedback — Send feedback to the maintainers about a missing tool, broken links, a bug, or stale data. Use this to send feedback, a bug report or a feat
get_feedback_reply — Read the feedback reply for a ticket from submit_feedback. Use this to read the maintainers' reply to feedback you sent with submit_feedback
index_tools — LinkedIn recruiter jobs feedback broken links: search openkrill MCP tools by task. Use this to find a tool for recruiter search, LinkedIn ke
Who runs the Domain Mail Check MCP server?
The Domain Mail Check MCP server at a glance
https://mailcheck.openkrill.app/mcpQuestions, answered
Is there an official Domain Mail Check MCP server?
Yes — Domain Mail Check operates its own remote MCP server at mailcheck.openkrill.app. gate connects you to that official endpoint and adds security scanning, per-tool access rules, and an activity log on top.
How do I connect Domain Mail Check to Claude or ChatGPT?
Add gate's gateway URL to your AI client once, then pick Domain Mail Check in the directory. No account or sign-in is needed. From then on, Domain Mail Check's tools are available in every client you've connected to gate.
Do I need to host anything?
No. Domain Mail Check runs the server, and gate is fully managed. You just connect one URL — there's nothing to install, deploy, or maintain.
Is the Domain Mail Check MCP server safe to connect?
It's the vendor's official endpoint, and gate scans its tools for prompt injection and hidden instructions before it goes live, re-checks it whenever it changes, and lets you allow, block, or require approval for every single tool.
Is it free?
Yes — you can get started with gate for free and connect Domain Mail Check in minutes. No credit card required.
Connect more than just Domain Mail Check
Every server below works through the same gateway URL — connect once, add tools anytime.
Squarespace DomainsDesignView →Set up Domain Mail Check in: Claude · Claude Code · ChatGPT · Cursor · VS Code
Give your AI Domain Mail Check — safely.
One URL. All MCPs. Full control. Free to start.
Get started free