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Headers have the IP address of their mail service.

• asveikau 3y ago
  Years ago they would include the IP of the end user. Gmail and hotmail stopped including that more than a decade ago. But they both used to. I think Gmail stopped this practice years ahead of Hotmail. I have a relative with mental health problems who lives on the street, and he sometimes writes me from public libraries -- kind of luckily for family members who are concerned about him, the webmail service he uses still includes that info in headers. So I usually know which public library he writes from.
  • cozzyd 3y ago
    When I was a PhD student ips in header were a great way to see if professors I was working with were traveling or not...