Browse topics
4 GUIDES
Email Security
How email works, why it can be faked, and how to investigate suspicious messages
How Email Works
Why anyone can send an email pretending to be anyone else, and what hidden information every email contains
7 min readEmail Authentication
SPF, DKIM, and DMARC: what these security checks do, what "pass" and "fail" mean, and why attackers still get through
8 min readEmail Investigation
How to view email headers, what to look for, and how to preserve emails as evidence
8 min readInvestigation Walkthrough: Targeted Phishing Campaign
Investigating a lookalike-domain phishing attack against a hospital network, from detection through incident response
11 min read