SpamCop is a free system that people can use to report spam that makes it through to their inbox. Here is a summary of what is needed:
To see if an IP address is listed in the SpamCop system:
https://www.spamcop.net/bl.shtml
Sign up for the service here:
https://www.spamcop.net/anonsignup.shtml
In order to report spam, you will need to know how to view, cut and paste the FULL HEADERS of the spam messages:
https://www.spamcop.net/fom-serve/cache/19.html
Once you sign up for the service, you will receive a welcome message from the SpamCop system. This e-mail message will have a special e-mail address to which you can send spam. It will also have a web link that you can use to report spam.
E Street uses the SpamCop system for spam filtering on many of our mail servers. Spam reports from users will filter down and help increase the effectiveness of our filtering.
