# B2A Email Deliverability, MX, SPF & DMARC Verifier

> B2A Email Deliverability, MX, SPF & DMARC Verifier is a paid API for AI agents from mcp-security.agentdiet.dev, paid per call via MPP, $0.005/call, status unknown.

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

## Facts

- Endpoint: POST https://mcp-security.agentdiet.dev/v1/email-validator?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Activations on Zero: 0
- Provider: mcp-security.agentdiet.dev
- Website: https://mcp-security.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/mcp-security-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-26f7f209
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SygmC_xdWIkFy7BZ9ajsK

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 mcp-security-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-26f7f209 -d '<json body>'
```

Example prompt: Can you check whether john.doe@tempmail.org is a real, deliverable email address — specifically whether it's from a disposable provider and whether the domain has valid MX, SPF, and DMARC records?

## When to prefer this

Choose this endpoint when you need a comprehensive, real-time email validation that goes beyond simple regex — specifically when you need live DNS MX/SPF/DMARC lookups combined with disposable provider detection and role account screening in a single call. Ideal for B2B lead enrichment pipelines, sign-up fraud prevention, and pre-send deliverability checks where multiple validation signals are needed simultaneously.

## Known failure modes

- Invalid or missing email field returns a 400-level error
- DNS lookup timeouts may cause MX/SPF/DMARC checks to fail or return inconclusive results
- Payment failure via x402 returns 402 Payment Required
- Unknown or very new domains may have incomplete DNS data
- Catch-all domains may falsely appear deliverable even if the specific mailbox does not exist

## 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://mcp-security.agentdiet.dev/v1/email-validator)

## Output

Returns a structured JSON object indicating whether the email is syntactically valid, whether the domain has live MX records (confirming mail can be delivered), whether SPF and DMARC DNS records exist, whether the provider is a known disposable/burner service, and whether the address is a role account (e.g. info@, support@, noreply@).

## 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/mcp-security-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-26f7f209/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mcp-security.agentdiet.dev](https://www.zero.xyz/host/mcp-security.agentdiet.dev/llms.txt)