Fixes, not fluff. DNS security and compliance guides for IT managers who already know the acronyms.
Google Workspace SPF setup: the correct include:_spf.google.com line, Mailchimp and HubSpot add-ons, and the migration mistakes that leave DMARC failing while Admin looks green.
SPF record syntax from v=spf1 through -all: includes, lookup limits, permerror traps, and provider templates. The reference we use before editing any production TXT record.
Copy-paste SPF templates for Microsoft 365-only mail, M365 plus Mailchimp or HubSpot, and hybrid setups. Cloudflare and GoDaddy publish steps included.
SPF PermError stops SPF evaluation entirely, breaking deliverability and DMARC alignment. Fix syntax errors, merge duplicate TXT records, and stay under the 10 DNS lookup limit.
New DNS advisories, monthly. What broke, who it hit, and the record that fixes it.
