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EML File Forensics and How It Facilitates Investigations?

Published By Aswin Vijayan
Approved By Anuraag Singh
Published On October 4th, 2023
Reading Time 4 Minutes Reading
Category Email Forensics

EML File Forensics plays a key role in making investigations streamlined. EML File Forensics is a part of digital forensics and penetrates through the data digitally. From the word digital, it is clear that the aim of this is to examine the data by recovering, analyzing, etc.

What is Email Header?

An e-mail contains three parts; envelope, header and the body. The envelope is hidden and the body is visible to the user. In case of header, user gets only the outside view like; to, from, subject, etc., the detailed view is buried within. Further expanding the header lets the user come across much more information.

Generally, one should be aware of the header portion since it can help us find whether one mail is authenticated or not.

Example of a header:


What Role Does the Email Header Play?

There are a number of reasons due to which an email header is important from an investigative point of view. Let us discuss some of the important portions of the header.

  • X-Apparently-To: This field reveals the recipient’s email address and can be used to validate email service providers.
  • Delivery To: This field indicates the address of the auto-mailer, which is responsible for delivering the message.
  • Received-SPF: This field displays information about the email service used for sending the message. It also includes an ID number that is useful for log examination to verify the email’s authenticity.
  • Message ID: This field serves as a globally unique identification for the email. This shows the exact time of transmission and version of the message.
  • MIME Version: This field extends the message format. This allows different types of content such as XML, Text, or HTML.
  • Content-type: This shows the format or type of content used in the message This provides information on whether it is XML, Text, HTML, etc.
  • X-Originating-IP & Received: These fields are important to trace the IP address used to send the email.
  • DKIM-Signature: This field stores the email’s signature and key-fetching information using a “tag=value” syntax. It plays a vital role in validating the domain name and identity associated with the message through cryptographic authentication.

Best Tool For EML File Forensics

SysTools EML Viewer Pro is the perfect tool for your basic forensic needs. This tool is widely to carry out EML File Forensics and is a reliable and a trustworthy tool.

EML File Analysis - View Modes

Key features of EML Viewer Pro are:

  • Various Preview Modes: Users can open and read EML files in multiple preview modes. These modes include Mail View , Properties View , Hex View , Message Header View , MIME View , RTF View , HTML View , and Attachments View.
  • Advanced Search Option: The utility offers a powerful search option which enables users to locate specific EML files in a large volume of files.
  • Various Preview Mode: EML Viewer Pro provides various preview modes for the different types of files that the user may use.
  • Selective Print or Export: Users can choose to print or save EML files in PDF format.
  • Batch Conversion to PDF: The software enables bulk conversion of EML files into PDF format. This feature simplifies the process of securely converting and storing multiple EML files.

EML Viewer Pro offers a comprehensive list of features, but it is important to note that forensic analysis professionals prefer more powerful and robust software solutions for thorough investigation of EML files.

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Most Advanced Tool For EML File Forensics

An advanced tool called MailXaminer is widely used by experts worldwide for EML file analysis and other email forensic investigations. This powerful software allows you to analyze your EML file data in a forensic manner.


  • Multiple Case Building: You can work on multiple EML files in different cases simultaneously using this feature
  • Support for Different File Formats: The tool has a wide range of file formats. This allows you to analyze various types of evidence related to your EML files.
  • Advanced OCR Capabilities: If your EML files contain images, this feature enables you to analyze and extract information from those images using OCR technology.
  • Search Analytics Windows: The tool offers various features like word cloud, timeline analysis, link analysis, and entity analysis, which visually present the data in a graphical form. This makes it easier to understand and derive insights from the analyzed EML files.
  • Multiple In-Built Search Options: There are several search options available, including General Search, Proximity Search, Fuzzy Search, Stem Search, Wildcard Search, and Regular Expression. These advanced search options help you efficiently search and sort through the data within the EML files.


In this article you will learn about the basics of EML File Forensics and how investigators carry out this process. The tools put to use by these experts are also present in this article. Choose your tools wisely and make your investigation easier.