# SYNTHORA Email Deliverability Check

> SYNTHORA Email Deliverability Check is a paid API for AI agents from deliver.hergertsynthora.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).

Audits a domain or email address for SPF, DKIM, DMARC, MX records and returns a deliverability/spam score via DNS-only lookup

## Facts

- Endpoint: POST https://deliver.hergertsynthora.com/service
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synthora-email-deliverability-check-75cebd25
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_uW7wcURTApSeZ8O3keU-z

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 synthora-email-deliverability-check-75cebd25 -d '<json body>'
```

Example prompt: Can you do a full email deliverability check on example.com — I want to see the SPF, DKIM, DMARC, and MX records along with the spam score?

## When to prefer this

Choose this endpoint when you need a deterministic, DNS-only deliverability audit for a single domain or email address and want a combined SPF/DKIM/DMARC/MX result plus a spam score in one call. Ideal for automated compliance checks, pre-send domain validation, or diagnosing email delivery problems. The Ed25519-signed response is useful when you need verifiable, tamper-evident results.

## Known failure modes

- Domain not found or does not exist — DNS resolution failure
- Invalid domain or email format in input — validation error
- No SPF/DMARC/DKIM records found — returns missing/empty for those fields
- Payment not provided or insufficient — x402 payment required error
- Rate limiting or DNS timeout — upstream DNS error response

## How this service works

Email deliverability and spam check: given a domain or email address, returns SPF, DKIM (common selectors), DMARC, MX records and a deliverability/spam score. DNS-only, deterministic, Ed25519-signed. Pay-per-use via x402 USDC on Base.

## Output

Returns SPF record details, DKIM results for common selectors, DMARC policy, MX records, and a numeric deliverability/spam score — all derived from live DNS lookups and signed with Ed25519 for authenticity.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "domain": {
   "type": "string",
   "description": "Domain or email address to audit"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "niche": "deliverability",
  "result": {
   "mx": [],
   "spf": {},
   "dkim": {},
   "dmarc": {},
   "score": 100,
   "domain": "example.com",
   "verdict": "good",
   "recommendations": []
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synthora-email-deliverability-check-75cebd25/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from deliver.hergertsynthora.com](https://www.zero.xyz/host/deliver.hergertsynthora.com/llms.txt)