All Domains with MX Servers

Comprehensive Database of Domains with MX Records

The All Domains with MX Records database from WebTrackly provides a massive collection of over 144 million domains that have active Mail Exchanger (MX) records configured in their DNS settings. This dataset represents one of the most comprehensive snapshots of the global email-capable domain landscape available today.

What Are MX Records?

MX records, short for Mail Exchanger records, are a type of DNS resource record that specifies the mail servers responsible for receiving email messages on behalf of a domain. When someone sends an email to an address like [email protected], the sending mail server performs a DNS lookup to find the MX records for example.com. These records point to one or more mail servers that are authorized to accept incoming email for that domain, along with priority values that determine the order in which servers should be tried.

The presence of an MX record is a strong indicator that a domain is actively used for email communication. Domains without MX records generally cannot receive email, making MX record data an essential signal for identifying domains with functioning email infrastructure.

What Is Included in This Dataset?

This collection contains 144,483,852 domains that have been verified to have at least one MX record configured. Each record in the dataset includes the domain name along with its associated MX server information, giving you a clear picture of the email infrastructure behind each domain. The data is compiled through large-scale DNS resolution and is regularly updated to maintain accuracy.

Key Data Fields

• Domain name — the fully qualified domain with active MX records
• MX server hostnames — the mail servers designated to handle email for the domain
• MX priority values — the preference order for each mail server
• DNS metadata — additional resolution details and timestamps

Who Uses This Data?

The MX records database serves a wide range of professionals and organizations across multiple industries:

• Email marketing companies use this data to identify domains with active email infrastructure, enabling better targeting and list validation for outreach campaigns.
• Email deliverability services rely on MX data to understand the email server landscape, optimize delivery routes, and troubleshoot bounced messages.
• Email Service Providers (ESPs) leverage MX record intelligence to improve sending reputation, understand recipient infrastructure, and enhance delivery rates.
• Cybersecurity and anti-spam researchers analyze MX records to detect suspicious mail server configurations, identify potential phishing domains, and map out spam infrastructure.
• Market research analysts study email provider market share by aggregating MX record data across millions of domains to understand adoption trends.

Common Use Cases

Finding Domains with Active Email for Outreach

Sales and marketing teams use MX record data to verify that target domains can actually receive email before launching outreach campaigns. This eliminates wasted effort on domains without email capability and dramatically improves contact rates.

Email Infrastructure Analysis

IT professionals and consultants analyze MX records to understand how organizations have configured their email systems. This includes identifying which email providers are used (Google Workspace, Microsoft 365, self-hosted solutions, etc.) and how redundancy is implemented through multiple MX entries with different priorities.

Anti-Spam and Security Research

Security researchers use large-scale MX data to identify patterns associated with spam operations, detect newly configured mail servers that may be used for malicious purposes, and monitor changes in email infrastructure that could indicate domain compromise.

Email Provider Market Share Analysis

By analyzing MX records across 144 million domains, researchers can determine the market share of major email hosting providers, track migration trends between platforms, and identify emerging players in the email hosting market.

Why Choose WebTrackly?

WebTrackly delivers high-quality domain intelligence datasets built on continuous, large-scale internet scanning. Our MX records database stands out for several reasons:

• Massive scale — over 144 million domains with verified MX records in a single download
• Data accuracy — records are collected through direct DNS resolution, not scraped from secondary sources
• Regular updates — the dataset is refreshed to reflect current DNS configurations
• Structured format — data is delivered in clean, structured formats ready for analysis and integration
• Affordable pricing — comprehensive email infrastructure data at a fraction of the cost of building your own scanning pipeline

Whether you are building email verification tools, conducting market research, or enhancing cybersecurity defenses, the All Domains with MX Records database provides the foundational data you need to succeed.