Step-by-step guides for DNS, email authentication, SSL and domain management.
Complete guide to DNS propagation — what it is, why it takes hours and how to check when it's done.
Explanation of reverse DNS (PTR record) — why it matters for email delivery, how to configure it and how to check it.
What information a domain WHOIS contains, what each field means and how to check expiry, registrar and nameservers.
Methodical approach to finding and fixing DNS problems — from NS delegation to MX misconfigurations.
Step-by-step guide to SPF, DKIM and DMARC — email authentication so your emails stop going to spam.
Main reasons emails go to spam — SPF/DKIM/DMARC errors, blacklisted IP, content triggers — and how to fix each one.
Guide to email headers — how to trace the path, check SPF/DKIM/DMARC results and identify spam indicators.
Guide to SSL certificates — what to check, how to read the chain, common errors and how to avoid expiry.