Answer :
Can often determine that an email message is a forgery by examining the the first received header.
What is first received header?
The Internet header of an e-mail message contains a list of technical details about the message. In most cases, only one administrator needs to see the Internet headers of messages. In email, the body (body) is always preceded by headers that identify specific routing information for the message, such as sender and recipients, date, and subject. Some headers are required. For example, FROM, TO, and DATE headers.
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