The show the path that a message takes from the message sender to the final recipient.
spammers may also add additional Received headers, before they send the message, to make it look like the message originated som
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They are read in reverse order:
- the first one is the one that delivered the message to its final destination
- The last one is the sender.
Received: by 172.16.84.104 with SMTP id ax2nko4a19iuvwy9mhdlr7d5wxu6sln7jocea;
Thu, 4 Feb 2021 18:00:11 GMT
You can get it formatted with the Message header toolbox.