Summary
Gives Claude a quick way to check if your email setup will actually land in inboxes. It audits SPF, DKIM, DMARC, and MX records for any domain and returns a 0-100 deliverability score. The server connects via SSE to a remote API at klymax402.com. You'd use this when debugging why emails are hitting spam folders, during domain migrations, or as part of automated checks before launching a campaign. The scoring gives you a single number to track rather than manually parsing DNS records and trying to figure out what's misconfigured.
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Public tool metadata for what this MCP can expose to an agent.
1 tools
email_audit_deliverabilityUse this when you need to audit email deliverability for a domain. Checks SPF record validity, DKIM selectors (google, default, selector1), DMARC policy, and MX records. Returns a deliverability score1 params
Use this when you need to audit email deliverability for a domain. Checks SPF record validity, DKIM selectors (google, default, selector1), DMARC policy, and MX records. Returns a deliverability score
Parameters* required
domainstringDomain to audit (e.g. example.com, gmail.com)
Email Deliverability Audit API
Email deliverability audit for any domain. SPF, DKIM, DMARC, MX validation with score 0-100 and fix recommendations. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.
Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.
Quickstart -- MCP
Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):
{
"mcpServers": {
"email-deliverability": {
"url": "https://email-deliverability.api.klymax402.com/mcp"
}
}
}
Quickstart -- HTTP (x402)
curl "https://email-deliverability.api.klymax402.com/api/audit?domain=..."
# -> 402 Payment Required, with an x402 payment challenge in the response body
Any x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.
Tools
| Tool | Method | Path | Price | Description |
|---|---|---|---|---|
email_audit_deliverability | GET | /api/audit | $0.012 | Audit email deliverability for a domain — checks SPF, DKIM, DMARC, MX records |
email_audit_deliverability | POST | /api/audit | $0.012 | Audit email deliverability for a domain — checks SPF, DKIM, DMARC, MX records (POST variant) |
email_audit_deliverability
Use this when you need to audit email deliverability configuration for a domain. Returns structured JSON with authentication record analysis and a deliverability score 0-100.
Parameters
| Name | Type | Required | Description |
|---|---|---|---|
domain | string | yes | Domain to audit (e.g. example.com, gmail.com) |
Example response:
{"score":65,"spf":{"found":true,"valid":true,"record":"v=spf1 include:_spf.google.com ~all"},"dkim":{"google":true,"default":false},"dmarc":{"found":true,"policy":"none","record":"v=DMARC1; p=none"},"mx":[{"priority":10,"exchange":"alt1.gmail-smtp-in.l.google.com"}],"recommendations":["Upgrade DMARC policy from none to quarantine","Add DKIM for default selector"]}
When to use: launching email campaigns, onboarding new domains for outreach, or diagnosing inbox placement issues. Essential for email marketers, sales teams, and IT admins managing domain reputation.
Not for: single email validation (use email_verify_address), finding email addresses (use email_find_by_name), domain WHOIS/DNS (use domain_lookup_intelligence).
email_audit_deliverability
Use this when you need to audit email deliverability configuration for a domain. Returns structured JSON with authentication record analysis and a deliverability score 0-100. POST variant of email_audit_deliverability -- same params passed as JSON body instead of query string.
Parameters
| Name | Type | Required | Description |
|---|---|---|---|
domain | string | yes | Domain to audit (e.g. example.com, gmail.com) |
Example response:
{"score":65,"spf":{"found":true,"valid":true,"record":"v=spf1 include:_spf.google.com ~all"},"dkim":{"google":true,"default":false},"dmarc":{"found":true,"policy":"none","record":"v=DMARC1; p=none"},"mx":[{"priority":10,"exchange":"alt1.gmail-smtp-in.l.google.com"}],"recommendations":["Upgrade DMARC policy from none to quarantine","Add DKIM for default selector"]}
When to use: launching email campaigns, onboarding new domains for outreach, or diagnosing inbox placement issues. Essential for email marketers, sales teams, and IT admins managing domain reputation.
Not for: single email validation (use email_verify_address), finding email addresses (use email_find_by_name), domain WHOIS/DNS (use domain_lookup_intelligence).
Example agent prompts
- "Audit email deliverability configuration for a domain"
- "Audit email deliverability configuration for a domain"
Payment
- Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
- Network: Base L2 (
eip155:8453) - Asset: USDC
- Facilitator: Coinbase CDP (primary), PayAI (fallback)
- Also reachable via ATXP (OAuth-wrapped x402, RFC 9728 protected-resource metadata)
Part of klymax402
100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.
- Catalog: https://klymax402.com/llms.txt
- Full API reference: https://klymax402.com/llms-full.txt
- Live stats: https://klymax402.com/stats
License
MIT
Featured
Keeps your Mac awake while Claude Code, Codex or Cursor works. Lets it sleep when they are done.
Try free for 7 days →Block distracting apps from your iPhone permanently without a 3rd party app. Free and open source.
Block now (100% free) →Notes, actions and memory. Without a meeting bot. First month 100% off.
Download for free →belt cli automatically finds the best tools and skills for your agent. image, video, music, tts...
one prompt install →Free an open-source skills that make AI coding agents easier to understand, verify, and control.
Download for free →Connect your Claude agent to live crypto prices and trading routes via 1inch
Get the MCP →
