How does DKIM help prevent email tampering?

DKIM adds a digital signature to the email header that the receiving server verifies against a public key in your DNS, ensuring the message content wasn't altered in transit.

Why do I need SPF, DKIM, and DMARC together?

SPF authorizes senders, DKIM ensures message integrity via signatures, and DMARC provides the policy on how to handle failures, creating a multi-layered defense against spoofing.

What tools can I use to validate my implementation?

You can use tools like MXToolbox, Google Postmaster Tools, and dmarcian to verify your DNS records and authentication status.

Does this skill support Google Workspace and Microsoft 365?

Yes, the implementation logic includes specific configuration steps and includes for major email providers like Google Workspace and Microsoft 365.

Is it safe to move directly to a DMARC 'reject' policy?

No, it is recommended to start with 'p=none' to monitor traffic, then 'quarantine', and finally 'reject' only after verifying all legitimate mail sources are authenticated.

Email Security (SPF, DKIM, DMARC) Implementation

Name: Email Security (SPF, DKIM, DMARC) Implementation
Author: micsapp

bymicsapp

0•

セキュリティとテスト

Secures organizational email domains by configuring SPF, DKIM, and DMARC protocols to prevent spoofing and phishing.

This skill provides a comprehensive framework for implementing the three pillars of email authentication—SPF, DKIM, and DMARC—within your infrastructure. It guides users through auditing current DNS records, generating cryptographic DKIM keys, defining restrictive SPF policies, and transitioning DMARC from monitoring to enforcement modes. By utilizing this skill, organizations can significantly reduce domain impersonation, improve email deliverability, and establish robust phishing defenses aligned with industry security standards and compliance requirements.

主な機能

010 GitHub stars

02Configuration templates for SPF mechanisms including IP ranges and third-party includes

03Automated auditing of existing SPF, DKIM, and DMARC DNS records via CLI tools

04Integration with Python scripts to parse and analyze DMARC aggregate XML reports

05Structured roadmap for DMARC policy progression from 'none' to 'reject' enforcement

06Step-by-step guidance for generating and formatting 2048-bit RSA DKIM keys

ユースケース

01Establishing security controls to meet SOC2, HIPAA, or other regulatory compliance requirements

02Improving email deliverability rates by verifying sender identity for major providers like Google and Microsoft

03Protecting an organization's domain from being used in phishing and social engineering attacks

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add micsapp/micstec-skills implementing-dmarc-dkim-spf-email-security

For use in Claude.ai and ChatGPT

主な機能

010 GitHub stars

02Configuration templates for SPF mechanisms including IP ranges and third-party includes

03Automated auditing of existing SPF, DKIM, and DMARC DNS records via CLI tools

04Integration with Python scripts to parse and analyze DMARC aggregate XML reports

05Structured roadmap for DMARC policy progression from 'none' to 'reject' enforcement

06Step-by-step guidance for generating and formatting 2048-bit RSA DKIM keys

ユースケース

01Establishing security controls to meet SOC2, HIPAA, or other regulatory compliance requirements

02Improving email deliverability rates by verifying sender identity for major providers like Google and Microsoft

03Protecting an organization's domain from being used in phishing and social engineering attacks