It looks Spamcop changed the way of login, tcpdump show me that spamcup do redirect to https: HTTP/1.1 301 Moved Permanently Server: Apache/2.2.17 (FreeBSD) mod_ssl/2.2.17 OpenSSL/0.9.8k mod_perl/2.0.4 Perl/v5.10.1 Location: https://members.spamcop.net Spamcup didn't handle https:// correctly due to missing ssl support for http::request. When I installed dev-perl/LWP-Protocol-https spamcup started works correctly.
Or dependency should be on dev-perl/libwww-perl[ssl].
removing.