MTA-STS Check

A domain's SMTP TLS posture — the MTA-STS policy (mode, MX, max_age) and the TLS-RPT reporting record.

Use this from the command line

curl -s https://ipcow.com/api/tools/mta-sts-check \
  -H 'content-type: application/json' \
  -d '{"domain":"example.com"}'