# B2A Email Deliverability, MX, SPF & DMARC Verifier

> B2A Email Deliverability, MX, SPF & DMARC Verifier is a paid API for AI agents from agentdiet.dev, paid per call via MPP, $0.005/call, status unknown (last checked 2026-10-21).

Validates an email address for syntax correctness, disposable/burner provider detection, role account flagging, and live DNS MX, SPF, and DMARC record checks.

## Facts

- Endpoint: GET https://agentdiet.dev/v1/spf-dmarc-auditor?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: agentdiet.dev
- Website: https://agentdiet.dev
- Canonical page: https://www.zero.xyz/c/agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-9d7889c3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_W6lqXmg13s1SmyKR6sP8Z

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 agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-9d7889c3
```

Example prompt: Can you check whether john.doe@example.com is a real, deliverable email address — specifically whether its domain has valid MX records, a proper SPF policy, and DMARC configured, and whether it looks like a disposable or role account?

## When to prefer this

Choose this endpoint when you need a comprehensive, real-time email deliverability and security check combining syntax validation, disposable provider detection, role account identification, and live DNS MX/SPF/DMARC lookups in a single call. Prefer it over basic syntax checkers when DNS-level deliverability and email authentication policy (SPF/DMARC) matter — e.g. before sending transactional email, onboarding users, or auditing B2B contact lists.

## Known failure modes

- Invalid or malformed email address provided — returns syntax error
- Domain has no DNS records (non-existent domain) — MX/SPF/DMARC checks fail with lookup error
- DNS timeout during live record resolution — partial results returned
- Empty email parameter — returns validation error for missing required field
- Payment failure via x402 — request blocked before processing

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

## Output

Returns a structured report on the email address covering: syntax validity, whether the domain uses a known disposable/burner provider, whether it is a role account (e.g. admin@, info@), live MX record presence and values, SPF record existence and policy, and DMARC record existence and enforcement policy.

## 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/agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-9d7889c3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentdiet.dev](https://www.zero.xyz/host/agentdiet.dev/llms.txt)