When you send an email, the email is most likely traceable because the email server automatically embeds the sender IP address into the headers. The email headers are normally hidden and not revealed by default. To view the email headers in Gmail, click the down arrow next to Reply icon and select Show Original. A new window will open showing the message headers. Most of the popular email service offered for free such as Hotmail and Yahoo shows the sender IP address in headers but weirdly not for Gmail.