It sounds like you've done the right thing.
SOME systems will include a header with the IP assigned to the
computer that ran the email client that connected to the server.
If you have that, you can search for other instances of that IP,
like on UseNet. But it may (usually will) be dynamically allocated
from a pool, meaning that it gets reassigned frequently.
Otherwise, you are dependent on the cooperation of the
sending host's system administrator.
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