spam.pl is a perl script which automates the process of sending complaint letters to spammers ISP’s. It strips out the proper address from the spams mail headers, taken via stdin.
You can download it from the following link: https://packetstormsecurity.com/files/download/22793/spampl-0.20.tar.gz
Source: https://packetstormsecurity.com/files/22793/spampl-0.20.tar.gz.html