bypassed

A web-based diagnostic toolbox that runs over 169 checks on DNS, email authentication (SPF, DKIM, DMARC), TLS certificates, HTTP headers, and blocklists to identify configuration issues. It serves developers, IT, and operations professionals in small to large companies who need to troubleshoot domain health and email deliverability. The platform is free to use, with optional paid features like watchlists and alerts, and emphasizes privacy by not selling queries and avoiding third-party trackers.

Key features

• DNS lookup and propagation check
• SPF, DKIM, DMARC checks
• TLS certificate inspection
• HTTP security headers check
• DNSBL and WHOIS lookup
• Email health audit with A-F grade
• Watchlist with scheduled re-checks
• Alerts via email, Discord, Slack, webhook
• Public API for automation
• Self-hosted and private infrastructure