Does MxToolbox Offer an API and What Are the Usage Requirements?

Yes — MxToolbox lists an API entry point on its site, so an API exists as part of the service. The MX Lookup page itself does not spell out API endpoints, authentication methods, rate limits, or pricing, so those specifics have to be confirmed through the API link or by contacting MxToolbox directly. What the page does make clear is a set of baseline conditions for using the service at all: JavaScript must be enabled, and use is governed by the site's Terms & Conditions and Privacy Policy.

What the MX Lookup page confirms

The page evidence for the MX Lookup tool shows the following, which is the extent of what can be stated from the source:

Because the page only surfaces the API as a navigation link, treat it as a pointer rather than documentation. Anything about request formats, keys, quotas, or commercial terms is not established by this page.

Conditions you can rely on before using the service

JavaScript must be enabled

The page explicitly states that JavaScript is required and that it is currently disabled. In practice this means:

• Input: you load the MX Lookup page in a browser with JavaScript turned off.
• Action: the page cannot run its lookup interface.
• Expected result: you see the JavaScript-disabled notice instead of a working tool.

If you are scripting or automating lookups, this is a signal that the browser-facing tool is not designed to work without JavaScript — a separate API path, if available, would be the relevant route rather than scraping the page.

Terms and privacy apply

Use of the service is subject to the linked Terms & Conditions and Privacy Policy. Read both before relying on the service for anything beyond casual checks, particularly if you plan to query domains you do not own or to feed results into another system.

Contact channel

The page lists a phone number, (866)-698-6652, as a contact route. This is the only contact method shown in the page evidence; no email address or support form is given there.

How to actually confirm API details

Since the page does not document the API, work through these steps:

1. Open the API link in the site footer. That is the entry point the site itself provides.
2. Check what the API page states about access — whether it requires an account, a key, or a paid plan. The MX Lookup page gives no pricing signals, so do not assume the API is free or open.
3. Read Terms & Conditions and Privacy before sending automated traffic, so you know what usage is permitted.
4. If the API page is unclear, use the listed phone number to ask about access requirements and limits.

What the MX Lookup tool itself does

Understanding the tool helps you judge whether you need the API at all. Per the page:

• It lists MX records for a domain in priority order.
• The lookup runs directly against the domain's authoritative name server, so MX record changes should show up instantly.
• A Diagnostics option connects to the mail server, verifies reverse DNS records, performs a simple Open Relay check, and measures response time.
• Each MX record (IP address) can be checked against 105 DNS-based blacklists (RBLs / DNSBLs).

If your need is occasional manual checking, the web tool covers it. If you need repeatable, programmatic checks, the API is the relevant path — but its requirements are not stated on this page and must be verified at the source.