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B2A Email Deliverability, MX, SPF & DMARC Verifier
B2A Email Deliverability, MX, SPF & DMARC Verifier is a paid API for AI agents from prompt-guard.agentdiet.dev, paid per call via MPP, $0.005/call, status unknown (last checked 2026-10-21).
Validates an email address for syntax correctness, disposable/burner provider status, role account detection, and live DNS MX, SPF, and DMARC record presence.
Price / call$0.005
Success—
StatusUnknown
How this service works
Validates email syntax, disposable/burner provider status, role accounts, and live DNS MX/SPF/DMARC records. (Live x402 v2, IETF MPP & MCP endpoint at https://prompt-guard.agentdiet.dev/v1/mx-deliverability-verifier)
Output
Returns a structured object indicating whether the email address is syntactically valid, whether the domain has live MX records (confirming mail can be received), SPF and DMARC record presence and configuration, whether the address belongs to a known disposable or burner email provider, and whether it appears to be a role account (e.g. admin@, info@, noreply@).
Example use cases
Pre-send lead list email hygiene
“Before we import these signups into our CRM, can you verify that hello@startup-x.io is a legitimate, deliverable email — not a throwaway address — and that the domain has proper MX, SPF, and DMARC records?”
Signup fraud detection for SaaS onboarding
“A new user just signed up with support@mailinator.com — can you tell me if that's a disposable or role-based email address so I can decide whether to flag the account?”
Cold outreach domain deliverability audit
“I'm about to send a cold outreach campaign to contact@bigcorp.net — can you check if that email address has valid MX records and DMARC protection so I know whether my messages are likely to be delivered?”
Technical details
Endpoint
GEThttps://prompt-guard.agentdiet.dev/v1/mx-deliverability-verifier?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a comprehensive, real-time email quality check combining syntax validation, live DNS MX/SPF/DMARC lookups, disposable provider detection, and role account flagging in a single call — particularly useful before adding contacts to a CRM, launching email campaigns, or validating user signups to reduce bounce rates and fraud. Prefer this over simple syntax-only validators when deliverability confidence and anti-abuse signals are important.
Side effects
- Invalid or malformed email input returns a syntax error or validation failure
- Domain has no MX records — domain exists but cannot receive email
- DNS lookup timeout or transient DNS failure may cause inconclusive results
- Disposable provider database may not cover brand-new or obscure throwaway services
- Rate limiting or payment failure (HTTP 402) if payment is not properly handled
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| emailrequired | string | Email address to validate for syntax, MX deliverability, and disposable risk |
Output
Schema · Response
{
"type": "object"
}Reviews
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