332 practical guides to website speed, SEO, email deliverability, DNS, security and automation, with fixes you can copy and paste.
What a professional email signature in the UK should include, the company details limited companies must show, image sizes that work, and accessibility tips.
Emails landing in spam? Learn the four real causes: missing authentication, poor sender reputation, risky content and dirty lists, plus the fixes for each one.
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.
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.
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.
The current Gmail, Yahoo and Outlook.com sender rules: 5,000-a-day thresholds, SPF, DKIM, DMARC, one-click unsubscribe, 0.3% spam rate and enforcement dates.
A repeatable email security audit for MSPs and IT providers: check SPF, DKIM, DMARC, MTA-STS, TLS and blacklists on every client domain, then report clearly.
Email security for solicitors: how conveyancing payment fraud works, what the SRA and NCSC advise, and how SPF, DKIM, DMARC and staff checks protect clients.
Email fraud protection for accountants: how invoice fraud and fake HMRC emails target practices, and how DMARC, MFA and client verification keep money safe.
How to open full email headers in Gmail, Outlook and Apple Mail, read the Received chain bottom-up, check SPF, DKIM and DMARC, and spot spoofing or delays.
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