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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 defi-yield.agentdiet.dev, paid per call via MPP, $0.005/call, status unknown (last checked 2026-10-28).
Validates an email address for syntax correctness, disposable/burner provider status, role account detection, and live DNS MX/SPF/DMARC record health.
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://defi-yield.agentdiet.dev/v1/email-check)
Output
Returns a structured object indicating whether the email passes syntax validation, whether the domain is associated with a disposable/burner provider, whether the address is a role account (e.g. info@, admin@), and the live DNS status of MX, SPF, and DMARC records for the email's domain — giving an overall picture of deliverability risk.
Example use cases
Scrub leads before CRM import
“Before I import this list of leads, check whether contact@leads-example.com is a real deliverable address or a disposable/burner email — also tell me if the domain has MX and SPF records set up properly.”
Detect fake signups at registration
“A user just signed up with signup123@mailinator.com — can you verify if that's a disposable or burner email and whether it would actually be deliverable, so I can decide whether to block the registration?”
Audit supplier contact email quality
“I need to send an invoice to accounts@new-vendor.biz — can you verify that email is syntactically valid, not a role-account risk, and that their domain has MX and DMARC records configured before I send?”
Technical details
Endpoint
POSThttps://defi-yield.agentdiet.dev/v1/email-check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a comprehensive, real-time email validation that goes beyond simple syntax checking — specifically when you need live DNS MX/SPF/DMARC verification, disposable provider detection, and role-account flagging in a single call. Prefer it over basic regex validators for CRM hygiene, lead qualification, fraud prevention at signup, or pre-send deliverability audits.
Side effects
- Missing or malformed email input returns a 400/validation error
- DNS lookup timeouts may result in incomplete MX/SPF/DMARC data
- Newly registered domains may have no DNS records yet, appearing undeliverable even if legitimate
- Private or internal email domains may not have public MX records
- Payment required (HTTP 402) if x402 payment header is missing or insufficient
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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