i noticed something interesting in my mail logs today – Gmail has been blocked by Spamcop

reject: RCPT from nf-out-0910.google.com[64.233.182.190]: 554 Service unavailable; Client host [64.233.182.190] blocked using bl.spamcop.net; Blocked – see http://www.spamcop.net/bl.shtml?64.233.182.190;

here's the spamcop database entry:
http://www.spamcop.net/w3m?action=blcheck&ip=64.233.182.190