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IP address is blacklisted in CBL (Composite Blocking List). What does it mean?
The CBL (Composite Blocking List) is primarily intended to be used by mail servers to block inbound undesirable email containing spam or malware that was emitted by a computer virus or some other infection. Refer to CBL frequently asked questions list for details.
If the server IP got blacklisted, identify the source of spam and prevent further spamming:
Then contact CBL to remove IP from the blacklist.