MxToolbox
Operator: MxToolbox, Inc., United States
Online tools for email headers, DNS data, mail servers and blacklist entries.
Technical Infrastructure
Product
The publicly accessible MxToolbox analysis tools, starting with the Email Header Analyzer. This profile also covers MX, DNS and blacklist queries, but not Delivery Center.
Availability and source date
Active
As of: 16 October 2026.
No functionality test has been performed.
Use in OSINT research
Helps examine the route taken by an existing email and the technical infrastructure of a domain. An email address alone is not linked to a person.
Queries
| Input | Result | Result type |
|---|---|---|
| Domain / website | MX records for the domain, prioritised by mail server; DNS queries return associated IP addresses. | Retrieved |
| IP address | Checks whether the mail server's IP address is listed on DNS-based email blacklists. | Technical check according to provider |
Features
- Makes email headers readable through RFC-822 parsing.
- Shows relay hops, delays and anti-spam results from the header.
- Retrieves a domain's MX and DNS records.
- Checks mail server IP addresses against DNS-based email blacklists.
Categories
- Technical Infrastructure
- DNS
Coverage
Dataset
User-supplied email headers and queries of public DNS data and external email blacklists.
Access
Requirements
The web tools described can be accessed without signing in. Header analysis requires the complete header of an existing email.
Export
Unknown
Provider
MxToolbox, Inc.
Country of establishment
United States
Interfaces
API
Available. Separate REST API for SuperTool queries and monitoring. Header analysis through the API is not described on the product page reviewed. Extended API functionality is paid.
MCP
Not documented. Not described on the product, documentation and API pages reviewed.
AI agents
Not documented. Not described on the product, documentation and API pages reviewed.
Usage note
The terms prohibit automated retrieval from the website using bots or scraping; MxToolbox offers a separate API for automated queries.
Legal note
Limitations
- Header analysis requires complete email headers; an email address alone is not sufficient.
- Technical findings do not confirm the sender's identity.
- Delivery Center and ongoing monitoring are separate paid offerings.
Guides and practical reports
Official · MxToolbox: How to Get Email Headers
MxToolbox, Inc. · EN
Shows how to extract complete headers from common email applications.