Verify mail server records, reverse DNS (PTR), and blacklist reputation to prevent transactional emails from hitting spam.
Tests MX priority ordering, PTR hostname matching, TLS encryption on mail delivery (STARTTLS), and presence on known spam blacklists (DNSBL).
Canonical test payload dispatched during security surface audits.
Missing reverse DNS PTR record for outgoing mail IPWatch the probe engine test this signature in an isolated sandbox.
Reverse DNS PTR Setup
PTR record missing or pointing to default ISP hostname
198.51.100.10.in-addr.arpa. IN PTR mail.example.com.
Configure reverse DNS PTR matching the HELO/EHLO hostname of your outgoing SMTP server to ensure high deliverability.
Copy and paste into your editor to refactor this issue automatically.
Test your public domain specifically for Email Deliverability & MX Health Scanner.
Checks commonly evaluated alongside Email Deliverability & MX Health Scanner during surface discovery.
Detect explicit software and framework version banners in response headers that help attackers target exploits.
Validate SPF, DKIM, and DMARC policies to protect your domain from impersonation, phishing, and email spoofing.
Verify cryptographic DNSSEC signatures to prevent DNS cache poisoning and man-in-the-middle resolution hijacking.
Audit your site across all 41 vectors automatically on every deploy.