https://www.spamcop.net/ces/contact.shtml
ERROR
Can't find server mail.spamcop.net
# nslookup mail.spamcop.net 1.1.1.1
Server: 1.1.1.1
Address: 1.1.1.1#53
** server can't find mail.spamcop.net: NXDOMAIN
# nslookup spamcop.net 1.1.1.1
Server: 1.1.1.1
Address: 1.1.1.1#53
Non-authoritative answer:
Name: spamcop.net
Address: 104.103.72.169
Name: spamcop.net
Address: 104.103.72.176