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Web-based email deliverability and network diagnostics: DNS, SPF, DKIM, DMARC, MX, blacklist and SMTP checks for domains.
Web-based email deliverability and network diagnostics: DNS, SPF, DKIM, DMARC, MX, blacklist and SMTP checks for domains.
mailX is a web service that analyzes email deliverability and network configuration for domains. It provides DNS and IP lookups, inspects MX records, verifies SPF, DKIM and DMARC configurations, checks blacklist status and inspects SMTP servers to diagnose deliverability issues. mailX also publishes an MCP server and a catalog of agent skills that allow AI agents to run automated diagnosis and remediation workflows (used by integrations like Claude/agent skills). The tool is aimed at developers, deliverability engineers, and administrators who need fast, actionable diagnostics for email routing and authentication problems.

Compare mailX: vs Deep Work Plan · vs Henji · vs Quartz · vs Agent-Reach