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>I thought gmail doesn't disclose sender's IP address? Or I was wrong? This is not good for privacy.

The IP address is the smtp server of course, not the individual user.

I learned that most email services do attach the IP address of the MUA (that is, the user's computer) if you send through SMTP. I set up an SMTP relay for myself to hide that.

The user's IP address is not attached if you use webmail.

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