Email Forensics and Your Company
A comprehensive guide to performing email forensics analysis of email headers, including email routing and authentication verification.
Introduction
Email forensics is the process of investigating and analyzing email communication to determine its origin, authenticity, and potential threats. This guide will walk you through key email forensic techniques, from examining email headers to verifying sender authenticity.
Understanding Email Headers
Email headers contain crucial metadata that helps identify the sender, recipient, and routing path. Analyzing email headers is essential in detecting phishing attempts and verifying email authenticity.
Tracing Email Origins
By examining IP addresses found in email headers, forensic investigators can trace the sender’s location and determine if the email was relayed through suspicious servers.
Email Authentication Techniques
Modern email authentication protocols help verify if an email truly comes from its claimed sender. Key protocols include:
- SPF (Sender Policy Framework): Confirms if the sending server is authorized.
- DKIM (DomainKeys Identified Mail): Uses cryptographic signatures for email validation.
- DMARC (Domain-based Message Authentication, Reporting, and Conformance): Aligns SPF and DKIM for enhanced security.
Identifying Phishing Emails
Phishing emails often contain red flags such as mismatched sender addresses, urgent requests, and suspicious links. Examining email headers and verifying authentication protocols can help detect phishing attempts.
Best Practices for Email Security
To mitigate email-based threats, organizations should:
- Implement SPF, DKIM, and DMARC policies.
- Train employees on phishing awareness.
- Regularly review email logs for suspicious activity.
- Use email filtering tools to block malicious messages.
Conclusion and Next Steps
Email forensics is the habit of inspecting origin and authenticity before you act on a message — especially payment changes, unexpected attachments, or anything that does not match how that sender usually writes. Start from the original .eml or .msg (not a forward), read authentication results and Received hops, and keep the file if you may need to report the incident. For a fuller map of message anatomy and a worked threats example, see the related guides.
Related guides
What email forensics actually looks at
Anatomy, extended headers, and what authentication can and cannot prove.
Examining headers on a threatening email
Preserve the original, then read the path — including the limits.
Supplier changed their bank details by email
The same header check before accounts payable updates a record.
Turn a raw header block into a readable report