# 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, and DMARC record checks.

## Facts

- Endpoint: POST https://mcp-security.agentdiet.dev/v1/email-check?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-6f7dd556
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_d0XXiTYVYCPMy4V1081pY

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-6f7dd556 -d '<json body>'
```

Example prompt: Can you check whether john.doe@example.com is a real, deliverable email address — including 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, multi-signal email validation that combines syntax checking, disposable provider detection, role account identification, and live DNS MX/SPF/DMARC record verification in a single call. It is especially valuable for agent workflows that need to gate signups, qualify B2B leads, or audit email infrastructure security without calling multiple separate DNS or email hygiene APIs.

## Known failure modes

- Invalid or malformed email input returns a syntax error
- DNS lookup timeouts for domains with unreachable nameservers
- Disposable provider list may not cover newly created burner services
- Missing or empty email field returns a 400-level validation error
- Transient DNS failures may cause intermittent MX/SPF/DMARC lookup failures

## 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-check)

## Output

Returns a structured object indicating email syntax validity, whether the provider is a known disposable/burner service, whether the address is a role account (e.g. info@, admin@), and live DNS lookup results for MX, SPF, and DMARC records on the email's domain, giving a comprehensive deliverability and risk 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/mcp-security-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-6f7dd556/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)