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I send my gmail emails from thunderbird (on Ubuntu machine). I am wondering whether thunderbird sends out the IP? If so, how can I hide my IP from the outgoing emails?

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Email clients (like Thunderbird) generally don't insert origin IP addresses (or other header lines) into sent emails.

Usually, if such a change takes place, it's done by the mail server that the email client connects to.

In this case, I tried a test email (Sent via Gmail on Thunderbird), and my IP does not appear in it. You should verify that this result is the same for you - Gmail will have multiple mail servers, and they may behave differently (e.g. for testing).

Edit: Oops, I'll address the "how to hide" part of the question.

Short answer: You can't hide your IP from the email server you connect to.

Long answer: You can't hide your IP from the email server you connect to, because by definition, you need to connect to it to send your email, and once you do that, it knows your IP address. Once it has that information, it can do anything it wants with it - log it, store it, alert the police, or insert it into the email header.

The only thing you can do is to connect to the mail server from an IP address that can't be linked back to you. So this means using a privacy-oriented network tool like Tor, or a trusted VPN. Or, use public WiFi, e.g. at your local library or Starbucks etc.

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I see an2IPv6 in 'Received {someIPv6}?? ([someotherIPv6]): from ' part of the email sent by thunderbird. What are these IPs? –  randon Nov 23 '13 at 22:16
    
It depends on where they appear in the headers (and whether you have IPv6 connectivity through to your ISP, which is still quite rare). At a guess, I'll assume you only have IPv4 back to your ISP, and so you are seeing a transaction between two email servers conducted over IPv6. –  scuzzy-delta Nov 23 '13 at 22:42
    
sorry I may have been unclear. My question is 'how to hide my IP from the email's receiver (not from google mail server)?. Of course the later is not possible. –  randon Nov 23 '13 at 23:01
    
The point I'm trying to make is that you can't do anything - the mail server you connect to decides whether or not to include the originating IP address. So the best alternative is to make sure your "regular" IP address isn't seen by the mail server. –  scuzzy-delta Nov 23 '13 at 23:05

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