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Understanding SPF, DKIM, and DMARC: A Simple Guide (github.com)

443 points by miles · 785 days ago · 119 comments on HN

Article summary

The article provides a simple guide to understanding SPF, DKIM, and DMARC, which are email security protocols used to prevent spam and phishing attacks. SPF, DKIM, and DMARC work together to verify the authenticity of emails and prevent unauthorized senders from sending emails on behalf of a domain. The article explains how these protocols work and provides examples of how they are used in real-world scenarios. By implementing these protocols, domain owners can protect their email communication and prevent email spoofing.

Main themes

  • Email Security
  • SPF, DKIM, and DMARC
  • Phishing Attacks
  • Domain Authentication
  • Email Spoofing

What commenters say

  • Some commenters appreciate the guide but note that it would be more useful to have a guide for developers who send emails using other people's domains.
  • There is a need for better understanding and implementation of SPF, DKIM, and DMARC among small businesses and non-technical users.
  • Some users have had success with a script that helps other parties correct their SPF records, but others are skeptical about its effectiveness.
  • The use of SPF macros is not well understood by many mail administrators, and some prefer to isolate services to subdomains instead.
  • The Blue Oak license used in the script is a permissive license that allows users to do whatever they want with the software, but some commenters have concerns about its terms.
  • Some commenters have experienced issues with email deliverability due to SPF records and domain reputation, and note that big email providers have too much control over what emails are accepted or rejected.
  • There are differing opinions on the effectiveness of SPF, DKIM, and DMARC in preventing spam and phishing attacks, with some commenters noting that these protocols are not foolproof.
  • The requirement for an imprint on German websites is seen as overly broad and burdensome by some commenters, who note that it can be difficult for private individuals to comply with the law.