# B2A Email Deliverability, MX, SPF & DMARC Verifier

> B2A Email Deliverability, MX, SPF & DMARC Verifier is a paid API for AI agents from email-verify.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 presence.

## Facts

- Endpoint: POST https://email-verify.agentdiet.dev/v1/spf-dmarc-auditor?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Provider: email-verify.agentdiet.dev
- Website: https://email-verify.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/email-verify-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-5540fc0a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_iWeD2JR5E59aMlvnh8thM

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability email-verify-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-5540fc0a -d '<json body>'
```

Example prompt: Can you verify whether john.doe@example.com is a real, deliverable email address — check if it's from a disposable provider, whether it's a role account, and whether the domain has valid MX, SPF, and DMARC records?

## When to prefer this

Choose this endpoint when you need a comprehensive, single-call email audit covering syntax, disposable provider detection, role account flagging, and live DNS MX/SPF/DMARC verification — especially for B2B lead enrichment, user onboarding fraud prevention, or email deliverability compliance workflows where all four checks are needed together rather than separately.

## Known failure modes

- Malformed or empty email input returns a validation error
- DNS lookup timeouts may result in inconclusive MX/SPF/DMARC results
- Unknown or very new domains may not have entries in disposable provider databases
- Rate limiting or payment failure (HTTP 402) if USDC micropayment is not processed
- Temporary DNS failures may cause false negatives on live record checks

## 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://email-verify.agentdiet.dev/v1/spf-dmarc-auditor)

## Output

Returns a structured object indicating whether the email address passes syntax checks, whether the domain is a known disposable or burner provider, whether the address is a role account (e.g. admin@, info@), and whether the domain's DNS records include valid MX, SPF, and DMARC entries — giving an overall deliverability assessment.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "email"
 ],
 "properties": {
  "email": {
   "type": "string",
   "minLength": 1,
   "description": "Email address to validate for syntax, MX deliverability, and disposable risk"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/email-verify-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-5540fc0a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from email-verify.agentdiet.dev](https://www.zero.xyz/host/email-verify.agentdiet.dev/llms.txt)