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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 preflight.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/DMARC record checks.
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://preflight.agentdiet.dev/v1/spf-dmarc-auditor)
Output
Returns a structured object indicating email syntax validity, whether the provider is a known disposable/burner service, whether the address is a role account (e.g. info@, support@), and live DNS lookup results for MX, SPF, and DMARC records on the domain — giving a comprehensive deliverability assessment.
Example use cases
Pre-outreach lead email validation
“Before I add these leads to my cold email campaign, can you verify that sarah.jones@techstartup.io is a real deliverable address, not a burner, and that the domain has proper MX and SPF records set up?”
Sign-up form disposable email check
“A user just tried to register with temp-mail123@guerrillamail.com — can you check if that's a disposable or throwaway email address and whether it would actually receive mail?”
Email domain authentication audit
“I need to know if the domain for newsletter@bigcorp.com has SPF and DMARC DNS records properly configured so our emails to them won't get rejected as spam.”
Technical details
Endpoint
GEThttps://preflight.agentdiet.dev/v1/spf-dmarc-auditor?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a single-call, comprehensive email health check covering syntax, disposable provider detection, role account identification, and live DNS MX/SPF/DMARC validation — especially for B2B lead enrichment pipelines, sign-up fraud prevention, or pre-campaign deliverability audits. Prefer it over basic regex-only validators when you need real DNS verification, or over full email-sending test services when you just need a non-invasive read-only check.
Side effects
- Invalid or malformed email string returns a syntax error or validation failure
- Domain has no MX records, indicating email cannot be delivered
- DNS lookup timeout if the domain's nameservers are slow or unreachable
- Missing or empty email parameter returns a 400 bad request
- Unknown or private TLDs may fail DNS resolution
- Payment required (HTTP 402) if x402 USDC micropayment is not supplied
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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