Blacklist in detail: 88.blacklist.zap

This blacklist is marked as private and may not be open for public use. We are not able to monitor this list either because it is not accessible to us or it's Terms of Use does not allow us to monitor it. We will be tracking it to see if it becomes open for us to use.

88.blacklist.zap IPv4

88.blacklist.zap is an internal blacklist maintained by Microsoft's Forefront. Because this list is not a public list we are not able to monitor IP's agains this list. If your IP gets listed the email returned will contain a message similar to the one below:

Client host XXX.XXX.XXX.XXX blocked using 88.blocklist.zap; Mail from IP banned. To request removal from this list please forward this message to

You may request delisting by sending an email to with the IP address you want removed from their list.

According to a blogpost by Microsoft the DNSBL resides on but is not publicly accessable. The DNS query is encrypted so that only Microsoft products can query the DNSBL.

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