How to replace email source ip address with 127.0.0.1 or private ip address

Hi I just found that someone’ email source ip address is 127.0.0.1 or private ip address. I think this is safe to protect own real ip address when the email is sent out. In order to know how it is done, I check it in internet, and the message that got back to me is that this can be done by a proxy server. So my question is without proxy server, this can be done? --- how is the original ip address replaced with 127.0.0.1 or private ip address when email is sent out ? If through proxy server, the email source ip address is ip address of the proxy instead of 127.0.0.1 or private ip address. Thank you.
EESkyAsked:
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Dave BaldwinFixer of ProblemsCommented:
You don't replace that, it is part of the tracking in all email headers.  You especially don't replace it with a phony address because when the receiving email servers read the headers, you don't want your email bounced.

If you have a Gmail account for example, your email will show the internal private IPs for the Gmail servers in the headers.  An email I sent from this computer thru Gmail shows my local private IP address followed by my public IP address.  Then it shows a Gmail internal IP address and a couple of Gmail server names also.
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EESkyAuthor Commented:
Thank you for your reply, but some emails that i received have 127.0.0.1 or private ip address only in the email header, while most of emails have public ip address. I do not know  how to configure it to hide the own public ip address.
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Dave BaldwinFixer of ProblemsCommented:
Like I said, you don't.  The mail servers put all that info in and they are supposed to.  What would be your purpose in hiding your IP address?  No one else's email hides their IP addresses.  If you are receiving emails with Only 127.0.0.1 in the headers, I would think that was spam.
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EESkyAuthor Commented:
@DaveBaldwin,  No, i do not agree with what you said. If you search internet, you would find many software which can help hide real ip address. for what ? for safety. That is purpose. otherwise the nat would lose a lot significance
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Dave BaldwinFixer of ProblemsCommented:
The kind of software that can hide your 'real IP address' when web browsing is called a 'proxy'.  The only way to do that with email that I know of is to get a Gmail or Yahoo account that works thru your browser.  In that case, all that is seen are the IP addresses of the Gmail or Yahoo email servers.  Standard email clients like Outlook and Thunderbird do not do that.

I'm curious what 'safety' you are referring to.  Every web site you go to gets your real IP address or they would not be able to sent the web pages back to you.  The only way to get real privacy on the internet is to turn off your computer.
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