I clearly remember many years ago that this wasn’t the case with Gmail, when looking for the source IP address in a case involving harassment of a person. I could only get Gmail’s own IP address in the headers from the multiple emails I examined at that time.
Nevertheless, as js2 said in another comment, it’s your mail provider (in this case Gmail) deciding whether to include the sender’s IP address or not.
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I clearly remember many years ago that this wasn’t the case with Gmail, when looking for the source IP address in a case involving harassment of a person. I could only get Gmail’s own IP address in the headers from the multiple emails I examined at that time.
Nevertheless, as js2 said in another comment, it’s your mail provider (in this case Gmail) deciding whether to include the sender’s IP address or not.