Secure Email Delivery: Implementing SPF and DKIM with Postfix

Course Overview: This course is designed to provide students with a comprehensive understanding of how to implement Sender Policy Framework (SPF) and DomainKeys Identified Mail (DKIM) to improve email security. You will learn how to set up SPF and DKIM on your mail server, create DNS records, configure OpenDKIM, and connect Postfix to OpenDKIM. By the end of the course, you will be able to implement these security measures to protect your email and prevent email spoofing.

Course Content:

• Introduction to email security and the need for SPF and DKIM
• Setting up SPF on your mail server
• Creating DNS records for SPF
• Testing SPF record propagation
• Setting up DKIM on your mail server
• Generating a private/public keypair for DKIM
• Publishing your public key in DNS records
• Testing DKIM key
• Connecting Postfix to OpenDKIM
• Configuring OpenDKIM Unix socket file
• Editing Postfix main configuration file to call OpenDKIM via the milter protocol
• Testing SPF and DKIM checks

Prerequisites: To enroll in this course, you should have a basic understanding of Linux and a working mail server. You should also be familiar with DNS configuration and have access to your DNS management console.

Duration: This course consists of 10 lessons and can be completed in approximately 5 hours.

Learning Outcomes: Upon completing this course, you will be able to:

• Implement SPF and DKIM on your mail server
• Create DNS records for SPF and DKIM
• Configure OpenDKIM and connect it to Postfix
• Test SPF and DKIM checks
• Improve email security and prevent email spoofing