332 practical guides to website speed, SEO, email deliverability, DNS, security and automation, with fixes you can copy and paste.
Learn what an SPF record does, how to read each mechanism and qualifier, copy-ready examples for Google, Microsoft 365 and ESPs, and mistakes that break SPF.
A practical DKIM guide: how email signing works, what selectors are, which key length to use, how to rotate keys safely and how to find your DKIM record in DNS.
Set up MTA-STS and TLS-RPT step by step: the DNS records, the policy file, web server config for Nginx and Apache, testing mode and a safe switch to enforce.
How MX priority works, what happens with equal priorities and backup MX, when to use a null MX, and the correct records for Google Workspace and Microsoft 365.
Work out whether your website is down for everyone or only for you, find the broken layer (DNS, hosting, SSL, CDN or your own network) and know who to call.
A plain-English guide to DNS records: what A, AAAA, CNAME, MX, TXT, NS and SOA records do, with real zone examples and the mistakes that break sites and email.
IPv6 for small business websites: how many users have it, whether you need an AAAA record, hosting and CDN support, IPv6 email PTR and SPF rules, and testing.
The best Cloudflare free plan settings for a small business: SSL mode, HTTPS, HSTS, TLS, caching, cache rules, bot and AI controls, WAF and DNS, step by step.
DNS over HTTPS explained: how DoH and DNS over TLS protect privacy, how browsers and Windows use them, what they mean for filtering, and how DNSSEC differs.
Point your domain to a new web host by changing nameservers or A records. A step-by-step guide to moving with no downtime and without breaking your email.
Learn what a CAA record does, how certificate authorities check it, and how to set CAA records for Let's Encrypt, Cloudflare and AWS without breaking renewals.
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