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In the sample Message-ID above, the mail system had used timestamp information of the message at the time when it was sent.

One part is before and another part is after mail services incorporate the date and time at which an email is sent, into the Message ID, along with other random strings of characters to distinguish it from other emails. In the above-mentioned figure, the Message-ID is are two parts of a Message-ID.

The following figures consist of a sample Message header: Figure 1: Part 1 of Sample Message header Figure 2: Part 2 of Sample Message headerĪfter analyzing the message header, the following information can be retrieved: Figure 3: Information retrieved from Sample Message header Message IDs are generated by client programs that send emails, such as Mail User Agents (MUA) or Mail Transfer Agents(MTA). It comprises a long string of characters that end with the Fully Qualified Domain Name (FQDN). This identifier is called Message-ID, a critical field in the email header. Taking a Closer Look at Message-IDĪccording to RFC 2822, the standard for the format of Advanced Research Projects Agency (ARPA) Internet text messages or emails, each email should have a globally-unique identifier to distinguish it from other emails. So, it is crucial to understand what Message-IDs are, how they are created and extracted, and how they can help investigators in extracting useful information. The email header is one of the vital resources that contains many important fields, one of which is Message-ID. When digital forensics investigators study emails to find the source of spoofed messages, they have to analyze every field of email architecture. Finally, we have highlighted some of the challenges of message IDs and how using an eDiscovery tool like Stellar Email Forensic can help counter these challenges. We have also discussed the parts of message-IDs, and how we can obtain message IDs in Gmail and Outlook. Summary: In this article, we have talked about the importance of message IDs in the forensic examination of emails. Looking Beyond Message-IDs for Comprehensive Forensic Email Analysis.Challenges with Message-ID in Email Forensics.