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MX Record Lookup and Mail Server Check
x402
MX Record Lookup and Mail Server Check is a paid API for AI agents from domain-dns.x402tookit.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-25).
Returns the mail servers (MX records) for a domain ordered by priority, with DNS resolution status for each host, and handles null-MX and implicit-MX edge cases.
Price / call$0.03
Success—
StatusUnknown
How this service works
Mail servers of a domain by priority, whether each resolves to an address, and null-MX or implicit-MX handling.
Output
Returns a structured object containing an array of MX records (each with host, priority, IPv4/IPv6 count, and a resolves boolean), a verdict string summarizing mail-readiness, a human-readable summary, an array of reasons explaining the verdict, flags for null-MX and degraded states, a timestamp, and optionally a source URL and disclaimer.
Example use cases
Pre-send email deliverability check
“Before we try to send that outreach email, check whether acme.com has working MX records — I want to know if the mail servers resolve and whether the domain is actually set up to receive email.”
Detecting null-MX or non-mail domains
“I'm cleaning our lead list — can you check if noreply-example.org is a domain that explicitly rejects email via null-MX or otherwise has no valid mail servers?”
Mail provider identification for a domain
“Which email provider does shopify.com use? Look up their MX records and tell me the hosts and their priority order.”
Technical details
Endpoint
GEThttps://domain-dns.x402tookit.com/mx-check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you specifically need MX record data — mail server hostnames, their DNS resolution status, priority ordering, and null-MX handling — rather than a full DNS record dump. It is more targeted than the all-records endpoint and more focused than the email address screen endpoint, making it ideal for mail routing validation, deliverability checks, and infrastructure audits where MX detail is the primary concern.
Side effects
- Domain does not exist — returns empty MX array with appropriate verdict
- DNS timeout — may return degraded flag set to true
- Invalid domain input — missing or malformed domain query parameter
- Domain has null-MX record (RFC 7505) — returned as null host entry with explanation
- Domain relies on implicit MX (A record fallback) — noted in reasons
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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