Is there away to know original email sender IP, I mean the client machine which is used to send the email not the smtp sever.
where in the header if any?
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The address will be in the last Received: header in the message headers.
Note, that if the user used some proxy (SOCKS or HTTPS), you’ll see proxy’s IP. Also the record can be forged by putting fake Received: headers to the bottom and making it look like the sender is just a resender.