SpamCop has been redesigned to act as a double-blind between ISPs and people reporting spam. All spam reports are addressed from [reportid]@report.spamcop.net. This email address is connected to your real reporting address, but it is filtered. The filter works like this:
When an ISP replies to their first SpamCop report, the email is forwarded to the correct person. However, at the same time, the ISP is sent back a challenge email asking them to verify by clicking a URL. If the same ISP (as identified by their "from" or "reply-to" header) tries to reply to other SpamCop reports without first responding to the challenge, their email will be unceremoniously deleted.
Paying members have some options not available to free users: