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.
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