Free MTA-STS Checker

Validate your MTA-STS DNS record and HTTPS policy file.

Checking DNS records…

Related MXFend tools

SMTP TLS Checker Test STARTTLS and TLS certificate health. TLS-RPT Checker Validate your TLS reporting DNS record. Email Security Score Complete domain report for authentication, reputation, and transport security.

MXFend uses essential cookies for security and product functionality. Analytics cookies are optional and consent-based. You can enable or disable them any time.

Cookie preferences

Choose which cookie categories you allow. Essential cookies are always enabled.

Strictly necessary (always on) Analytics Marketing

MXFend

Free email deliverability tools for domains.

Tools

Email Deliverability Checker SPF Checker DMARC Checker MX Checker

Guides

Email auth guide Emails going to spam Domain reputation SMTP TLS MTA-STS TLS-RPT