DMARC can stop spoofed spam and phishing from reaching you and your customers, protecting your information security and your brand. However, complexity and misconceptions deter many organizations from ever deploying it. Part mythbusting , part implementation guide, this post explains the shortcomings of SPF and DKIM, what DMARC is, how to deploy DMARC properly, and how to respond to DMARC reports – all without the need for an additional vendor, thanks to open source software!
This is an embedded Microsoft Office presentation, powered by Office Online.This is an embedded Microsoft Office presentation, powered by Office Online.
Modern email authentication relies on a combination of three standards: SPF, DKIM, and DMARC. These standards help ensure that a message came from a server related to the domain owner and was not spoofed.
SPF was the first widely adopted standard for combating email spoofing. Despite its limitations in preventing spoofing, most email recipients expect you to have it deployed on your domain. For example, Gmail/G-Site/Google will throttle incoming emails from domains that do not have a valid SPF record.