What are domain monitoring tools (MxToolbox, HetrixTools, etc.)?
Domain monitoring tools track DNS health, authentication configuration, and blocklist status for your sending domains. MxToolbox, HetrixTools, dmarcian, and similar services provide configuration testing and ongoing monitoring.
Functions include: DNS record validation (MX, SPF, DKIM, DMARC), blocklist checking across multiple lists, authentication testing with detailed diagnostics, and alerting when configurations change or problems emerge.
These tools complement ESP analytics by focusing on infrastructure health. They catch: DNS misconfigurations, expired DKIM keys, SPF record errors, and blocklist appearances that might not surface in delivery metrics until damage is done.
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