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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 2026-10-23).
Validates an email address for syntax correctness, disposable/burner provider status, role account detection, and live DNS MX/SPF/DMARC record checks to confirm 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://prompt-guard.agentdiet.dev/v1/email-verify)
Output
Returns a structured object indicating: email syntax validity, whether the domain is a known disposable/burner provider, whether the address is a role account (e.g. info@, support@), live MX record presence and details, SPF record validity, DMARC record presence and policy, and an overall deliverability verdict.
Example use cases
Screening signups for fake emails
“Before I activate this new user account, can you verify that their email signup@tempmail.io is legitimate — not a disposable burner address — and that the domain actually accepts mail?”
Qualifying sales leads before outreach
“I have a lead with the email contact@acmecorp.com — can you check if it's a valid deliverable address with proper MX and SPF records set up before I add them to our outreach sequence?”
Validating bulk list before email campaign
“Check whether info@bigretailer.com is a role account or a real deliverable inbox, and confirm the domain has DMARC configured, so I know if it's worth including in our campaign.”
Technical details
Endpoint
POSThttps://prompt-guard.agentdiet.dev/v1/email-verify?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a comprehensive, multi-signal email validation that goes beyond simple syntax checks — combining live DNS MX/SPF/DMARC lookups with disposable provider and role account detection in a single call. Prefer it over basic regex validators when lead quality, email campaign deliverability, or user signup fraud prevention is the goal.
Side effects
- Invalid or malformed email string returns a syntax error flag
- Domain with no MX records results in undeliverable verdict
- DNS lookup timeout may result in inconclusive MX/SPF/DMARC status
- Disposable provider databases may have coverage gaps for very new burner services
- Payment failure via x402 returns HTTP 402 before validation occurs
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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