Read a bit more around the FAQs, and apparently this isn't the correct forum for this problem... This is a mailhost configuration problem and so this thread should probably be moved there. I wasn't very specific in my first post, sorry.
1) I reported spam.
2) I get a "supposed receiving system not associated…" message, from which I understood that Lycos have changed their mailservers conf.
3) I try to re-register their mailhosts through the mailhost configuration tool.
4) Mailhost configuration tool sends me 3 emails. I forward them to the specified address.
5) I get 3 messages back, each saying "Spamcop account configuration: error" and the contents of each is:
"Sorry, but SpamCop has encountered errors:
Source IP not found.
Your email host does not appear to correctly identify the sending IP of
the email you receive."
So, turetzsr - what I meant by "registering my account" was actually configuring Lycos' mailhosts through the mailhost configuration tool.
Wazoo - thanks, I'll post a mangled version of the headers here. I'd also appreciate if you'd tell me how to contact the deputies. Or should I send the full headers to you so you'd forward them?
Here are the mangled headers from one of my mailhost configuration emails:
X-DAUM-WEB-MAILER-FIRST-LINE: From service[at]admin.spamcop.net; Fri Nov 10 07:09:20 2006
X-DAUM-INTERNAL-HOST: received by 126.96.36.199
Received: from sc-app2.spamcop.net ([188.8.131.52]) by hermes of bos-mail-rmail6.bos.lycos.com (127.0.0.1) with SMTP id aAA78i7sr182066490 for
<----[at]lycos.com>; Fri, 10 Nov 2006 07:08:44 -0500 (EST)
Received: from [184.108.40.206] by spamcop.net
with HTTP; Fri, 10 Nov 2006 12:08:58 GMT
From: SpamCop robot <mhconf.-------------------[at]cmds.spamcop.net>
Subject: [spamCop] account configuration email
Date: Fri, 10 Nov 2006 12:08:58 GMT
X-Mailer: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:220.127.116.11) Gecko/20061025 Firefox/18.104.22.168
via http://www.spamcop.net/ v1.603