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DNS, mail & TLS certificates in practice
When a website or e-mail stops working, the cause is surprisingly often DNS, mail authentication or certificates. These articles show how to check, which commands to use and the typical mistakes.
DNS migration without downtime: TTL, order of steps and a checklist for domain and hosting moves
Switch hosting, DNS provider or registrar without losing website or e-mail: lower the TTL early, copy the zone, test before the cutover.
Mail landing in spam: SPF, DKIM and DMARC alignment explained
SPF passes but mail still lands in spam? Why DMARC needs alignment, how to read mail headers and how to roll out SPF, DKIM and DMARC in order.
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