Email Security
All tools →MX Health
MX records, A/AAAA resolution, port 25, null MX (RFC 7505). — free, private, client-side. API: POST /api/v1/tools/mx-health
MX Health — records, resolution & port 25
Lists MX hosts, resolves A/AAAA, probes TCP 25 and detects null MX (RFC 7505) and duplicate priorities.
Runs 100% in your browser — no data leaves your device. For programmatic use:
curl -X POST /api/v1/tools/mx-health -d '{ "input": "hello" }' → JSON. See /docs/api.