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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-check)
Output
Returns a structured object indicating: email syntax validity, whether the domain uses a known disposable/burner email provider, whether the address is a role account (e.g. info@, admin@), and the presence/validity of live DNS MX, SPF, and DMARC records for the email domain — enabling a comprehensive deliverability and fraud-risk assessment.
Example use cases
Pre-send lead list email hygiene
“Before I send my outreach campaign, verify that sarah.jones@prospectco.io is a legitimate deliverable email — not a burner or role address — and that the domain has MX and SPF records set up properly.”
New user signup fraud check
“A user just signed up with noreply@mailinator.com — can you check whether that's a disposable throwaway address and whether the domain even has valid MX records so I know if I should block the registration?”
B2B contact enrichment validation
“I pulled a contact email cto@startup.xyz from LinkedIn — can you verify it's syntactically valid, not a role alias, and that startup.xyz actually has MX and DMARC DNS records configured before I add it to my CRM?”
Technical details
Endpoint
GEThttps://prompt-guard.agentdiet.dev/v1/mx-check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a comprehensive, single-call email check that combines syntax validation, disposable-provider detection, role-account flagging, and live DNS MX/SPF/DMARC record verification — particularly in B2B lead enrichment, user signup fraud prevention, or pre-campaign list hygiene workflows where deliverability and security posture matter. Prefer it over simple syntax-only validators when DNS record correctness is critical.
Side effects
- Invalid or malformed email string provided — returns syntax error
- Domain does not exist or has no DNS records — MX/SPF/DMARC fields return absent/null
- DNS lookup timeout for the domain — may return partial results
- Rate limiting or payment failure (HTTP 402) if USDC micropayment is not settled
- Empty email parameter — required field validation error
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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