CybersecKyle Security How-To Series: Power User and Small Team, Part 2 - Email Security with SPF, DKIM, and DMARC

I am back with Season 3, Part 2 of the Power User and Small Team track in my CybersecKyle Security How-To Series. This time we are making domain email harder to spoof with SPF, DKIM, and DMARC, without turning DNS into a self-inflicted outage.Email is still one of the messiest trust systems we use every day.Your domain might send email from Google Workspace, Microsoft 365, a website host, a newsletter platform, a receipt system, a CRM, a help desk, and that one plugin someone installed two years ago and forgot about.Then phishing shows up pretending to be you.SPF, DKIM, and DMARC do not fix all email abuse. They do make it much harder for someone to send mail that claims to be from your domain without authorization. They also give receiving mail systems a clearer signal about what should happen when authentication fails.The catch: if you guess, you can break your own mail.So we are going to inventory first.What you are buildingBy the end of this guide, you should have:A list of…