How would I do this? (expert tricks) OT

[Marc Perkel]

I have a server with port 25 closed. I was to be able
to run a script every time someone tries to connect to
port 25, but from the outside the port remains closed.
I need the script that I'm going to run get the IP
address that tried to connect.

I know it's off topic but it's part of an experiment
to stop spam. 

Thanks in advance.



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