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Email Deliverability Checker
x402
Email Deliverability Checker is a paid API for AI agents from relay402.georgespring.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-13).
Checks a domain's email deliverability posture by inspecting MX, SPF, and DMARC DNS records, returning a risk score, risk level, summary, and DNS evidence.
Price / call$0.005
Success—
StatusUnknown
How this service works
Checks whether a web email address is deliverable and likely valid.
Output
Returns a risk score (numeric), risk level (e.g. low/medium/high), a human-readable summary of the domain's email deliverability posture, and supporting DNS evidence including MX, SPF, and DMARC record details.
Example use cases
Vendor onboarding email security audit
“Before we start receiving invoices from this new supplier, can you check the email deliverability posture for their domain acmesuppliers.com? I want to make sure their SPF and DMARC records are properly configured and see what the overall risk level looks like.”
Investigate emails landing in spam
“Our sales team keeps saying emails from partnerfirm.io are going straight to spam — can you check their email deliverability setup and tell me if there are any issues with their MX, SPF, or DMARC records that might explain why?”
Pre-send campaign domain audit
“We're about to launch a big email campaign from our new domain brandnewsender.com — can you audit its email deliverability posture and let me know if everything looks good with our DNS records before we hit send?”
Technical details
Endpoint
GEThttps://relay402.georgespring.workers.dev/api/web-email-deliverabilityWhen to prefer
Use this endpoint when you need a quick, structured assessment of a domain's email deliverability health — specifically MX, SPF, and DMARC coverage — without needing to set up your own DNS resolver. Ideal for due diligence on new vendor domains, pre-send deliverability audits, or security triage of unknown senders.
Side effects
- Invalid domain format returns a validation error
- Domain with no DNS records may return high risk or missing-record indicators
- Non-existent domain returns an error or high-risk result
- Network timeout reaching DNS resolvers may cause a failed lookup
- Private/internal domains may return incomplete results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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