Why DNS matters for websites
Most website owners think of DNS only as the thing that makes a domain point to a server. But DNS records also control email delivery, protect against email spoofing, and affect how browsers and crawlers reach your site. Misconfigured DNS records cause problems that are difficult to diagnose without knowing where to look.
MX records
MX records direct email for your domain to the right mail servers. If MX records are missing or misconfigured, email to your domain will fail silently. This is particularly common after domain transfers or migrations where DNS was not fully updated.
SPF and DMARC
SPF (Sender Policy Framework) specifies which mail servers are authorized to send email on behalf of your domain. DMARC builds on SPF and DKIM to give receiving mail servers clear instructions about what to do with messages that fail authentication — reject them, quarantine them or report them.
Without DMARC, your domain can be used for phishing and spoofing with no mechanism to stop it. A p=none policy is a starting point for monitoring. Move to p=quarantine or p=reject once you have confirmed legitimate senders are covered.
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Redirect behavior
Redirect chains — where one redirect leads to another — add latency and can cause SEO equity to dissipate through the chain. Each hop in a redirect costs time. Audit your redirect paths and collapse multi-hop chains into single redirects wherever possible.
www consistency
Your website should consistently resolve to either www.example.com or example.com — not both. Serving content on both without a canonical redirect creates duplicate content and splits link equity across two URLs.
CDN and server detection
Knowing which CDN or server is in front of your website helps diagnose performance and configuration issues. CDN presence affects cache headers, security header configuration and geographic performance. Server detection helps identify whether headers and compression are being set correctly.