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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 2026-10-23).
Validates an email address for syntax correctness, disposable/burner provider status, role account detection, and live DNS MX, SPF, and DMARC record verification.
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/email)
Output
Returns a structured object indicating whether the email passes syntax validation, whether the domain has live MX records confirming deliverability, whether SPF and DMARC DNS records are present and valid, whether the address belongs to a known disposable or burner email provider, and whether it is a role-based address (e.g. info@, support@, admin@).
Example use cases
Scrubbing leads before outreach
“I have a lead email address contact@startup-xyz.io — can you verify it's actually deliverable, not a disposable inbox, and that the domain has proper MX and SPF records set up before I add it to my cold outreach sequence?”
Blocking burner signups at registration
“A user just tried to sign up with temp-mail123@guerrillamail.com — can you check whether that's a disposable or burner email provider so I can decide whether to block the registration?”
Auditing email list quality
“Can you run deliverability checks on newsletter@techblog.dev and tell me if it has valid MX records, passes SPF and DMARC, and isn't a role-based address, so I know whether it's worth keeping on our list?”
Technical details
Endpoint
POSThttps://preflight.agentdiet.dev/v1/email?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a comprehensive, multi-signal email validation that goes beyond simple format checking — specifically when live DNS MX/SPF/DMARC lookup matters, disposable/burner provider detection is required, or role-account identification is needed. Prefer it over basic regex validators when email deliverability and fraud prevention are the goals, and over general-purpose enrichment APIs when DNS correctness and spam-infrastructure signals are the priority.
Side effects
- Invalid or malformed email input returns a syntax error
- DNS lookup timeout if the domain's nameservers are unresponsive
- Domain with no MX records flagged as undeliverable
- Unknown or novel disposable providers may not be detected
- Rate limits or payment failure (HTTP 402) if payment not properly handled
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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