# InboxGuards Email Test - Email Address Validator

> InboxGuards Email Test - Email Address Validator is a paid API for AI agents from api.inboxguardstest.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-17).

Validates an email address for syntax correctness, MX deliverability, disposable domain status, and role account detection without sending any mail or performing an SMTP probe.

## Facts

- Endpoint: GET https://api.inboxguardstest.com/v1/email-check?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-17
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/inboxguards-email-test-email-address-validator-611185ec
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_F3FaquIU0AJLGn1vzPskL

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 inboxguards-email-test-email-address-validator-611185ec
```

Example prompt: Can you check whether jane.doe@example.com is a valid, deliverable email address — specifically tell me if it has working MX records, if it's a disposable domain, or if it's a role account like info@ or support@?

## When to prefer this

Choose this endpoint when you need a fast, cheap, non-intrusive email check that covers syntax, DNS deliverability, disposable domains, and role accounts without triggering any mail delivery or SMTP handshake. It is ideal for pre-validation at signup forms, CRM hygiene, fraud screening, and lead qualification pipelines where speed and privacy matter. Prefer it over SMTP-probe services when you must avoid any contact with the recipient's mail server, or when cost per check needs to stay at $0.005.

## Known failure modes

- 400 error returned for bad email syntax — not charged
- Domain has no MX record but has implicit A/AAAA fallback — may still be marked deliverable
- Disposable domain list may not include very new throwaway services
- SMTP-level bounces (mailbox does not exist) are not detected — false positives possible
- Network timeouts on DNS lookups for obscure domains

## How this service works

InboxGuards Email Test: Email address check: syntax, MX, disposable and role account (no SMTP probe). Checks one address without sending mail: RFC syntax, whether the domain accepts mail (MX, null MX, implicit A/AAAA), disposable domain (CC0 list), role account (info@, support@...), free provider. Verdict ok / risky / undeliverable. No SMTP probe, so mailbox existence is not confirmed. Bad syntax: 400, never charged.

## Output

Returns a verdict of 'ok', 'risky', or 'undeliverable', along with flags indicating whether the email failed RFC syntax, whether the domain has valid MX/A/AAAA records (or a null MX), whether the domain is on a known disposable-domain list, whether the local part matches role account patterns (info@, support@, etc.), and whether the domain is a free email provider. No SMTP connection is made, so mailbox existence is not confirmed.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "email"
     ],
     "properties": {
      "email": {
       "type": "string",
       "maxLength": 320,
       "description": "Email address, e.g. jane@example.com"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/inboxguards-email-test-email-address-validator-611185ec/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.inboxguardstest.com](https://www.zero.xyz/host/api.inboxguardstest.com/llms.txt)