depends heavily on what was used to send the email. If the subject in question was on gmail, then no you wont be able to pull an IP from the header. If they sent thru some different server using something like outlook, that's a different story. If they're sending you email from a cell phone or mobile device, the IP is going to do nothing for you.
Either way, what do you plan on doing with the IP address? You wont be able to get anything definitive without a court order.. Why not just block the damn emails?
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