[ExchangeList] 88.blacklist.zap - Anyone know where this blacklist is?

The following recipient(s) could not be reached:

      username@xxxxxxxxxxx on 24/10/2006 10:33 AM
            There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.
            <srv.example.ca #5.5.0 smtp;550 Service unavailable; Client host [123.123.123.123] blocked using 88.blacklist.zap; Mail From IP Banned>

<Note: the real domains and IP addresses were replaced in the error>

I will contact the recipients email administrator to see if they know!

Thanks,
...D

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