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Lookproof Mail Provider Identifier
x402
Lookproof Mail Provider Identifier is a paid API for AI agents from api.lookproof.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-31).
Identifies the mail hosting provider and email sending services for a domain by analyzing its MX records and SPF include tree
Price / call$0.005
Success—
StatusUnknown
How this service works
Check SPF, DMARC, DKIM, MTA-STS, DNSSEC and more, with results that explain what was found and why. Free browser checks and a pay-per-request API with x402.
Output
Returns a structured list of identified mail providers for the domain, including the mailbox provider behind the primary MX, any inbound gateways, and sending services found in the SPF include tree. Each match includes the provider name and the MX or SPF evidence that triggered the match, drawn from a fixed versioned reference list.
Example use cases
Identify competitor email infrastructure
“Look up who hosts email for salesforce.com — I want to know their mailbox provider and any sending services authorized in their SPF record.”
Detect stale SPF provider authorization
“Check whether our old email provider SendGrid is still authorized to send for example.com in our SPF record, even though we switched providers last month.”
Email security audit for client domain
“I need to know every mail provider and sending service that's authorized for clientdomain.io — pull it from their MX hosts and SPF tree so I can audit their email setup.”
Technical details
Endpoint
GEThttps://api.lookproof.dev/v1/mail/provider?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to definitively name the mail provider(s) behind a domain rather than just retrieve raw DNS records. It is ideal when an agent needs to classify email infrastructure at scale, audit SPF authorization after a provider migration, or identify whether a domain uses Google Workspace, Microsoft 365, Proofpoint, Mimecast, or another named provider — without having to manually parse and match MX hostnames or SPF include chains yourself.
Side effects
- Domain not found or no MX records — returns empty or null provider list
- Invalid domain format — returns validation error
- Domain has no SPF record — SPF-based sending services not enumerated
- Unrecognized mail infrastructure — returns raw MX/SPF data without a named provider match
- Network timeout resolving DNS — returns error response
- Rate limit exceeded — returns 429 or payment-required error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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