| sacka_man | 02-14-2013 08:42 PM | Gmail does show the originating IP. Test it yourself. Send a message to somebody, anybody. Then go to the sent email, click the dropdown arrow, and choose "Show Original". http://i.imgur.com/LWdrKnn.png
The raw source of the email will show. This is similar to the way the HTML source of a webpage works. The IP address you sent from will be the "X-Originating-IP" value in the email header. Other identifiable information could be injected into email headers as well, such as browser information, but I don't think Gmail does this. In the one I just tested sent from Gmail, no identifiable information is there other than your IP.
To be safe, I would never respond to Gmails unless I am behind my stealth IP. I personally connect to eBay through a VPS, which gives me a stealth IP - if I respond to Gmail messages behind the IP, it would just look like a normal email response.
EDIT: Weird, I just tested this through my VPS and my IP address did not show up in the email headers - there is no "X-Originating-IP" value at all. However, when sending from my home IP, the IP did show up in the email headers. Both are Gmail accounts. Any idea why the difference? |