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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 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://prompt-guard.agentdiet.dev/v1/email)
Output
Returns a structured object indicating: whether the email syntax is valid, whether the domain is from a known disposable/burner provider, whether it is a role account (e.g. info@, admin@, noreply@), and the live DNS lookup results for MX, SPF, and DMARC records — giving a comprehensive deliverability and authenticity picture for the address.
Example use cases
Signup fraud prevention screening
“Before creating this account, check whether the email address they signed up with — tempuser@mailinator.com — is a disposable burner address or a real deliverable inbox.”
B2B lead list hygiene
“I have a lead from our CRM with email contact@acmecorp.io — can you verify it's syntactically valid, not a generic role address, and that acmecorp.io actually has MX records set up so emails won't bounce?”
Email domain security audit
“Check whether the domain on this vendor's email address — billing@globalpartners.net — has SPF and DMARC records properly configured so I know it's not spoofable.”
Technical details
Endpoint
GEThttps://prompt-guard.agentdiet.dev/v1/email?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a comprehensive, multi-signal email validation that combines syntax checking, disposable/burner detection, role-account identification, and live DNS record lookups (MX, SPF, DMARC) in a single call. It is especially well-suited for AI agent workflows that need to verify email quality before outreach, onboarding, or lead enrichment, particularly in B2B or fraud-sensitive contexts. Prefer it over simple regex-based validators when you need live DNS confirmation of deliverability, or over domain-only tools when you need the full email address validated end-to-end.
Side effects
- Missing or empty email parameter returns a 400 error
- Malformed email string may return syntax-invalid without DNS checks
- DNS timeout or unreachable authoritative nameserver may result in incomplete MX/SPF/DMARC results
- Payment not received (HTTP 402) if x402 micropayment is not completed
- Very new or obscure domains may not be in disposable provider lists yet, leading to false negatives
- Rate limiting if called too frequently without proper payment flow
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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