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Testing SPF, DKIM, and DMARC

Testing SPF, DKIM, and DMARC

If you are interested in a step-by-step implementation of SPF, DKIM, and DMARC, there’s a post for that! It’s on this site as well and it will walk you through the entire process. https://www.linuxincluded.com/implementing-spf-dkim-and-dmarc/ Before you jump into testing SPF, DKIM, or DMARC, you need to verify where your authoritative DNS nameservers are. The easiest way to do this is by going to a Linux command line and performing a whois. # whois linuxincluded.com   Domain Name: LINUXINCLUDED.COM   Registry Domain ID: 1985890536_DOMAIN_COM-VRSN   Registrar WHOIS…

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Implementing SPF, DKIM, and DMARC

Implementing SPF, DKIM, and DMARC

If you made it here, you might not be interested in the why’s of implementing the holy trinity – SPF, DKIM, and DMARC – of anti-email spoofing. However, if you’re still uncertain whether you should or shouldn’t, just do it! With the guide below, you’ll see it isn’t all that difficult and when used together, they provide great benefits like brand protection, reducing a phishing attack vector, less chance of your legitimate marketing emails ending up in spam, etc. It also…

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Stop CEO/CFO Domain Spear Phishing

Stop CEO/CFO Domain Spear Phishing

Pretty bold title… While it is nearly impossible to stop any motivated attacker/phisher, I also believe in doing every bit you can to improve your environment and these steps will go a long way to helping your situation. I will talk about two primary ways to put an end to CEO/CFO spear phishing. Realize upfront that you should not do one step without the other. I will also talk about the ins and outs of these techniques as well as some of…

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