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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.
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 address is syntactically valid, whether the domain has live MX records capable of receiving mail, whether the address belongs to a known disposable/burner email provider, whether it is a role-based account (e.g. admin@, info@), and the presence and validity of SPF and DMARC DNS records on the domain.
Example use cases
Screening sign-up emails for fake accounts
“Before we let this user into our platform, can you verify that the email they signed up with — user4821@guerrillamail.com — is not a burner or disposable address and actually has working MX records?”
B2B lead list email hygiene check
“I have a lead I'm about to email: cto@acmecorp.io — can you confirm the email is syntactically valid, not a role account, and that the domain has proper MX, SPF, and DMARC records set up before I reach out?”
Pre-send deliverability audit for outreach
“We're about to send a cold outreach to info@startupxyz.co — can you check if that email will actually be deliverable, flag whether it's a role address, and tell me if their domain's DMARC and SPF are configured?”
Technical details
Endpoint
POSThttps://prompt-guard.agentdiet.dev/v1/email?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a single, comprehensive email validation that combines syntax checking, DNS MX/SPF/DMARC live lookups, disposable provider detection, and role-account flagging in one call — especially in agent workflows that charge per-use via x402 micropayments and need fast, reliable verdicts before sending emails or admitting users.
Side effects
- Malformed or missing email input returns a validation error
- DNS lookup timeouts may occur for domains with slow or unresponsive nameservers
- Newly registered domains may not yet have propagated MX/SPF/DMARC records
- Some disposable providers may not be in the known blocklist and could be missed
- Payment failure via x402 will block the call if USDC balance is 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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