# Email Deliverability Check

> Email Deliverability Check is a paid API for AI agents from x402.professorsausages.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).

Checks an email address for deliverability signals including RFC5322 syntax validity, live MX/SPF/DMARC DNS records, and flags for disposable, role-based, free-provider, or unicode addresses

## Facts

- Endpoint: POST https://x402.professorsausages.com/email-check/check
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/email-deliverability-check-96eac4dc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2PezTuhD3LcIv5KImbNHt

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 email-deliverability-check-96eac4dc -d '<json body>'
```

Example prompt: Can you check whether john.doe@example.com is a real, deliverable email address — I want to know if the domain has MX records, whether it passes SPF and DMARC, and if it's a disposable or role-based address?

## When to prefer this

Choose this endpoint when you need a multi-signal email deliverability assessment beyond simple regex validation — specifically when you want live DNS checks (MX, SPF, DMARC via DoH) combined with disposable/role/free-provider detection in a single call. Prefer this over simple syntax validators when building sign-up flows, cleaning email lists, or screening leads, and you need to catch throwaway addresses and misconfigured domains before attempting delivery.

## Known failure modes

- Invalid or malformed email address input returns a syntax error
- Domain has no DNS records or is unreachable, MX check returns negative
- DoH (DNS-over-HTTPS) resolver temporarily unavailable, DNS checks may fail
- Rate limiting or payment failure returns 402 or 429 error
- Disposable provider database may not include newly created throwaway domains

## Output

Returns a set of deliverability signals for the email address: RFC5322 syntax validity, live MX record presence, SPF and DMARC DNS record status (queried via DoH), and boolean flags indicating whether the address is from a disposable provider, is a role-based address (e.g. info@, support@), is from a free email provider, or contains unicode characters. This is a signals report, not an SMTP send guarantee.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/email-deliverability-check-96eac4dc/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.professorsausages.com](https://www.zero.xyz/host/x402.professorsausages.com/llms.txt)