Anybody receiving an email from you can read the headers (if they know how) and use online tools to see where you are located in the World, and what ISP you used to send the email, along with any relays that were involved in getting it to them.
Once you have sent out an email you cannot conceal the source codes. If you fear retribution from something you said to somebody in an email your only recourse is to try to make amends or hope they don't know how to trace the sender.
Your incoming emails can only be traced by opening them and reading the source code headers. You can easily do that (if you know how), but for a hacker to do that he would have to have your login name and password, for your (yahoo) email account(s) in question. He would then need to login to that account and set the Email Options to display the full headers, and copy them.
Why do you think anybody would want to go to all that trouble just to get your email headers? Aside from Homeland Security, the FBI, or another police agency with a warrant, I can't think of any reason on Earth why anybody would bother to do that.
If you know of a specific threat against your email account(s) please post the details here and I can advise you further.
Wiz[This message was edited by Wiz Feinberg on 29 October 2005 at 02:53 PM.]
