# B2A Email Deliverability, MX, SPF & DMARC Verifier

> B2A Email Deliverability, MX, SPF & DMARC Verifier is a paid API for AI agents from mcp-compiler.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 status, and live DNS MX, SPF, and DMARC record checks.

## Facts

- Endpoint: GET https://mcp-compiler.agentdiet.dev/v1/email-check?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: mcp-compiler.agentdiet.dev
- Website: https://mcp-compiler.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/mcp-compiler-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-841a7a66
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_T9Mya0PJdPakp6YA8jvZn

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-compiler-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-841a7a66
```

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

## When to prefer this

Choose this endpoint when you need a comprehensive, multi-dimensional email check that covers both format validation and live DNS verification (MX, SPF, DMARC) in a single call, and when disposable/burner or role-account detection is important — for example, during user sign-up fraud prevention, lead list hygiene, or vendor email trust assessment. Prefer this over simple regex validators when real-time DNS deliverability and security record checks are needed.

## Known failure modes

- Missing or malformed email parameter returns a validation error
- DNS lookup timeouts if the email domain is unreachable or slow to respond
- Unknown or newly registered disposable providers may not be detected
- Role-account detection may produce false positives for legitimate custom role addresses
- Non-existent TLD or purely invalid syntax may return an error rather than a structured result

## 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-compiler.agentdiet.dev/v1/email-check)

## Output

Returns a structured object indicating whether the email passes syntax validation, whether the domain is associated with a known disposable or burner provider, whether it is a role-based account (e.g. admin@, info@), and the live DNS lookup results for MX, SPF, and DMARC records, providing 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/mcp-compiler-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-841a7a66/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mcp-compiler.agentdiet.dev](https://www.zero.xyz/host/mcp-compiler.agentdiet.dev/llms.txt)