Can someone tell where I am emailing from using another computer?

Question

Recently, I was emailing from a secured business computer and I have reason to believe that the location got back to someone. Can this be done? What does "secured" mean?

Answer 1

You can find the path that a mail message takes using the headers in the mail message. This path can be manipulated to look incorrect, but the starting location and all the intermediate locations are in the header. The IP addresses of these locations are in the headers.

So the real question is what is the starting location. That location should be your mail server (not the machine you sent the email from). What you described should only be possible if you sent the mail from the mail server.

Secured usually means the access to the machine is limited to known people. This access limitation also usually means that the software running on the machine is clean (so it doesn't allow unknown people access), and that firewalls are restrictive.