My Server's IP was listed in spamcop,and I cann't know which email send the bad mail!

<[email protected]>
Newsgroups gmane.mail.spam.spamcop.email
Organization SpamCop
Message-ID <[email protected]> 
   My Server's Ip is 61.129.64.172,listed in spamcop' blocking list
yestoday.I delisted this ip by myself using email address
[email protected]

But this morning,this ip was listed again,I cann't find the email which
sended the bad mail,someone or spamcop'master who can help me? please send
mail to [email protected]

Thanks!
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