Use authorized targets
Run network checks only against systems you own or have explicit permission to assess.
EMAIL SECURITY · FREE TOOL
Email Security Check
Inspect MX, SPF, DMARC, DKIM, MTA-STS and TLS-RPT records.
AUTHORIZED PUBLIC CHECKS ONLY
Clear results without unnecessary data collection.
Enter only a public domain you own or are authorized to assess. Results are not stored by the tool.
A DKIM selector cannot be discovered reliably; add it only when your email provider gives you the value.
SAFE USE
Practical, transparent and privacy-aware.
Keep secrets out
Never paste passwords, access tokens, private keys or confidential customer data into diagnostic tools.
Confirm important findings
Automated results are a starting point. Validate changes in a staging environment before production.
Review regularly
Certificates, DNS records and web configurations change, so repeat important checks after deployments.