The 'Received' field in an email header is the most useful for identifying the originating IP address because it shows the sequence of servers through which the email passed, including the original sender's server. Other fields like 'From' and 'Return-Path' can be easily spoofed and do not reliably provide this information. The 'Message-ID' is primarily used to identify the email uniquely but does not provide origin details.
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What does the 'Received' field in an email header tell us?
Why can the 'From' and 'Return-Path' fields be easily spoofed?
What is the significance of the 'Message-ID' in an email header?