DNS vulnerabilities are weaknesses in how your DNS is set up or managed. See 10 common DNS security risks, how to test for each, and how to fix them.

Key Takeaways SPF records use mechanisms, qualifiers, and modifiers to define which sources can send email for your domain. Mechanisms such as include, a, mx, ptr, and exists can trigger DNS lookups, while ip4, ip6, and all do not…

DKIM=none means no DKIM signature was found on the message — not a failed check. Here's what the header means, why it happens, and how to fix unsigned mail.