This example is for spam originating from yahoo, afaict, but it seems to me there is little or no interest at large isps to facilitate reporting and removal of their spammer clients.
For example, I receive a spam mail and look at "Full Headers" in my mail program:
I do a whois lookup on what I think is the originating IP:
and I forward the spam, with full headers, to the listed abuse email addy:
That bounces, with:
I have gone to the webpage referenced in the whois records:
# The following results may also be obtained via:
on that page, gone to:
from there, to:
where is the text of this topic:
Point of Contact
Note ARIN has attempted to validate the data for this POC, but has received no response from the POC since 2010-06-18
Once, I sent an email to ARIN, asking if there was some agency with the authority to enforce the rules/protocols but got no answer. I see smaller, one-man isps with abuse email boxes that are full and larger outfits who filter and bounce the spam reports as spam. There doesn't seem to be an effective system in place to enable reporting and stopping the spammer.
I do see this: Got Spam? Report it here.
and have used that.
I wonder whether http://www.spamcop.net/ has a different POC for yahoo than what whois returns.....