Every email message includes a block of text at the top that is referred to as the header. The header contains details about the message, including the sender's information, the recipient's information, the servers that handled the message as it traveled from the sender to the recipient, etc. However, many email clients don't display the header information by default.
To view the full header information using different email clients:
In the Message Options window, the headers display in the Internet Headers field.
The headers display in the Internet Headers for this Message field.
Header info will display in the Message details window that appears.
The headers display at the top of the email message.
The headers display at the top of the email message.
This will automatically send the email as an .EML attachment.
The headers display at the top of the email message.