What is MXToolBox?
MXToolBox provides a suite of free and paid tools for analyzing DNS records and diagnosing email infrastructure configuration problems. Administrators use the platform to check mail server health, verify authentication protocols, and monitor IP addresses against major blacklists. The service helps organizations maintain strong sender reputations and avoid delivery failures.
MXToolBox operates as a specialized diagnostic platform focused on email deliverability and domain health. Users can query their domain's MX records, SPF configurations, DKIM signatures, and DMARC policies to identify misconfigurations that trigger spam filters or bounce messages. The platform aggregates data from hundreds of email blacklists, alerting teams when their IPs or domains get listed. Paid tiers add continuous monitoring, automated alerts, and detailed reporting for teams managing high-volume sending. By surfacing infrastructure issues before they impact campaign performance, the tool supports both technical administrators and revenue teams relying on outbound communication.
Ideal Customer Profile
Any organization that depends on reliable email delivery for outbound sales, marketing, or transactional messaging will benefit from this platform.
Key Features
- MX record lookup and validation
- SPF record checker and syntax validator
- DKIM selector testing
- DMARC policy analyzer
- Blacklist monitoring across hundreds of lists
- SMTP diagnostics and mail flow testing
- Domain health overview dashboard
- Automated alerting for listing events
- Email header analysis
- Bulk IP and domain checking
- Deliverability reporting
How to use MXToolBox
Teams typically start by entering their sending domain or IP address into the lookup tools to retrieve a baseline health report. From there, administrators address any flagged authentication gaps or blacklist appearances, then activate ongoing monitoring to catch future issues as they arise.
Pricing
Pricing not publicly listed.
