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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 x402-audit.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 to assess deliverability.
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://x402-audit.agentdiet.dev/v1/email-validator)
Output
Returns a structured assessment of the email address covering: syntax validity, whether the domain uses a known disposable/burner email provider, whether the address appears to be a role account (e.g. info@, admin@), and live DNS lookup results for MX, SPF, and DMARC records indicating whether the domain is configured to receive and authenticate email.
Example use cases
CRM lead quality screening
“Before we import these leads, can you verify that contact@acmecorp.io is a legitimate business email — not a disposable address or a generic role account — and that the domain actually has working MX records?”
Cold outreach bounce prevention
“I'm about to send a cold email campaign to sarah.jones@prospectcompany.com — can you check if that address will actually deliver, and whether the domain has SPF and DMARC configured?”
Sign-up fraud detection
“A new user just registered with throwaway99@mailinator.com — is that a burner or disposable email address I should flag and block from completing sign-up?”
Technical details
Endpoint
GEThttps://x402-audit.agentdiet.dev/v1/email-validator?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a combined, per-address check of syntax, DNS deliverability (MX), and anti-spoofing records (SPF/DMARC) in a single call — particularly useful for lead enrichment, sign-up validation, or cold outreach pipelines where disposable and role-account filtering is also needed. Prefer this over simple regex or SMTP-ping tools when authoritative DNS record presence matters.
Side effects
- Missing or malformed email parameter returns an error
- DNS lookup timeout for domains with slow or unreachable nameservers
- False negatives on newly created disposable domains not yet in blocklists
- Role account heuristics may misclassify unusual but legitimate addresses
- HTTP 402 payment required if x402 payment header is missing or invalid
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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