what does these mean?

[M.W. Chang]

    ----- The following addresses had permanent fatal errors -----
<tk at lodz.tpnet.pl>
     (reason: 554 <cm61-10-50-59.hkcable.com.hk[61.10.50.59]>: Client 
host rejected: Host rejected because of spam it sent.)

    ----- Transcript of session follows -----
... while talking to kiezmar.lodz.tpsa.pl.:

 >>>>>> DATA

<<< 554 <cm61-10-50-59.hkcable.com.hk[61.10.50.59]>: Client host 
rejected: Host rejected because of spam it sent.
554 5.0.0 Service unavailable
<<< 554 Error: no valid recipients

BTW, I have set up my sendmail as a mail server and my ISP hkcable 
didn't block outgoing traffic from port 25. How could it intercept and 
reject this message sent from my sendmail directly?


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