mailverdict
Validate email addresses: detect disposable accounts, typos, and check deliverability.
Checks email addresses for syntax errors, disposable/burner domains, role accounts, free providers, and typos. Performs MX record lookups and returns a deliverability score. No API key required.
Try asking Muse: "Check if a customer's email address is valid and deliverable before sending them a receipt."
Source: Found in the official MCP Registry (dev.mailverdict/mailverdict) · First listed September 24, 2026
Last 24 hours
Each bar is one check, every 15 minutes. Green means it answered. Last checked 53 min ago.
Is it safe to connect?
What Muse can see: It does not ask you to sign in, so it cannot see your accounts. It only sees what Muse sends it from your request.
Before it acts: Read what Muse plans to do before you approve it, and remove the app from Muse when you stop using it.
musedirectory.ai is not part of Meta. More about how Muse handles your information
How to add it to Muse
Not in Muse's Connectors list yet, but Muse can still use it. Copy the request below and paste it into Muse. Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
https://api.mailverdict.dev/mcpNot in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
Technical details: safety screening, tools, response time and recent checks
Response time at the last check: 142ms. Worked in 100% of checks over 30 days.
Screening · September 24, 2026
Screened, no issues found
Screening looks for known threats and hidden instructions at the time of the check, and runs again weekly and whenever the tool list changes. It cannot see the server's code, so only connect what you need and review what Muse asks to do. How screening works.
Tools · 2
check_emailCheck an email address: syntax, disposable/burner domain, role account, free provider, typo suggestion, MX records. Returns result (deliverable|undeliverable|risky|unknown), reason, score 0-100, and per-signal booleans.check_domainCheck a domain: disposable/burner list membership, free-provider status, typo suggestion, MX records.Recent checks
Link
https://api.mailverdict.dev/mcpQuestions about mailverdict in Muse
How do I connect mailverdict to Muse?
Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use mailverdict to help me. It is a free service with an MCP server at https://api.mailverdict.dev/mcp. It does not need an API key. Ask me before you share anything with it." Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
Is mailverdict working right now?
At the last check (September 28, 2026, 08:16 UTC) the endpoint was working, answering in 142ms. Over the last 7 days it answered 100% of health checks. It is checked every 15 minutes.
Is mailverdict safe to connect to Muse?
It was screened on September 24, 2026 with the result "screened, no issues found". Screening checks the domain against threat feeds and reads the tools for hidden instructions and requests for passwords or card numbers. It cannot see the server's code, so grant only the access you need.
What can mailverdict do in Muse?
It exposes 2 tools, including check_email, check_domain. For example, you could ask Muse: "Check if a customer's email address is valid and deliverable before sending them a receipt."
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This listing was added from public sources (Found in the official MCP Registry (dev.mailverdict/mailverdict)). If you build mailverdict, claim it to correct the details and get your badge.
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