MXToolBox

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.