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.
Fix SPF PermError too many DNS lookups: how the 10-lookup limit is counted, how to audit nested includes, and safe ways to trim, move to subdomains or flatten.
Learn to read DMARC aggregate (rua) reports: what each XML field means, how to sort sources into legitimate, misconfigured and spoofed, and what to fix first.
A one-page email authentication checklist for small businesses: SPF, DKIM, DMARC, unsubscribe, MTA-STS, BIMI and parked domains, with the records to publish.
How to find your DKIM selector from email headers or your provider's settings, with the selectors Google Workspace, Microsoft 365, Mailchimp and SendGrid use.
Understand DMARC p=none, quarantine and reject, how SPF and DKIM alignment work, what changed in RFC 9989, and a step-by-step plan to reach enforcement safely.
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