# 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 (last checked 2026-10-21).

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 and legitimacy.

## Facts

- Endpoint: GET https://mcp-security.agentdiet.dev/v1/disposable-email?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- 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-53851a2a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_cSueYPs_rfs3vza3jYA_Y

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-53851a2a
```

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

## When to prefer this

Choose this endpoint when you need a comprehensive, multi-signal email check combining syntax validation, disposable provider detection, role-account flagging, and live DNS MX/SPF/DMARC lookups in a single call. Prefer it over simple regex-only validators when deliverability and anti-fraud signals matter, such as gating user signups, qualifying B2B leads, or auditing contact lists before email campaigns.

## Known failure modes

- Missing or malformed email parameter returns a 400/422 error
- DNS lookup timeout if the domain's nameservers are slow or unresponsive
- Unknown or newly registered domains may lack MX/SPF/DMARC records, returning empty DNS fields
- Payment not fulfilled triggers an HTTP 402 response requiring x402 USDC payment
- Rate limiting may occur for high-frequency queries without proper payment

## 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/disposable-email)

## Output

Returns a structured object indicating whether the email passes syntax validation, whether the domain is a known disposable/burner provider, whether the address is a role account, and the live DNS status of MX, SPF, and DMARC records for the domain.

## 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-53851a2a/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)