189 articles in DNS
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DNS
SPF DKIM DMARC Guide
A complete guide to SPF, DKIM, and DMARC. Learn how email authentication prevents spoofing and improves deliverability.
DNS
DNS Propagation Time
Explains DNS propagation delays, ISP caching, resolver behavior, and acceleration strategies.
DNS
SPF Include Chains: Staying Under the 10-Lookup Limit Without Flatteners
Keep email authentication reliable—master 5 strategies to prevent SPF PermErrors and stay under the 10-lookup limit—avoid the risks of flattening services.
DNS
dig for Beginners: Five Commands Every Domain Owner Should Know
Use the 5 essential `dig` commands to troubleshoot DNS—check IP, verify email configuration, track propagation, identify nameservers, and review TXT records. Stop guessing.
DNS
Default TTLs at Registrars: What They Are and When to Override
Control DNS caching with Time To Live (TTL) values. Learn the standard 3600s default—and when to optimize by using shorter or longer TTLs for specific needs.
DNS
Safe Record Deletion: Retiring Old DNS Entries Without Outages
A methodical guide to safely retiring obsolete DNS records without causing outages—reduce security risks, management complexity, and costs.
DNS
TXT Quoting & Escaping: The Most Common Cause of Broken Verifications
Troubleshoot DNS TXT record failures—learn about the complex formatting rules for quoting, escaping, and the 255-character limit—ensure reliable SPF, DKIM, and DMARC records.
DNS
SRV Records Made Simple: SIP, XMPP, and Game Servers
Learn how SRV records simplify service discovery for VoIP, XMPP, and game servers—explaining their structure, priority, weight, and common configuration mistakes.