Deep dive on the complexities of email in this one:
- Overview of how SMTP works
- The simplicity of SMTP protocol
- How email spoofing works
- Reading Received headers
- Sending Policy Framework (SPF) for spoofing prevention
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My SANS Courses:
- SEC450 - Blue Team Fundamentals: https://sans.org/sec450
- MGT551 - Building and Leading Security Operations Centers: https://sans.org/mgt551

PDF Guide to Security Operations: https://www.sans.org/security-resourc...
Blueprint Podcast: https://sans.org/blueprint-podcast
Twitter:   / sechubb