Someone or something on your network sent spam to the spamsources.fabel.dk nds blacklist. Some networks (in particular in South America and Asia) do not maintain good records in Whois, so a very large netblock including your IP might have been included in this list.

Fabelsources Reports Sources Of Spam

Spam-based Blacklists are those that will list either single IP Addresses or entire ranges that have actually received Spam, i.e. Unsolicited Bulk Email (UBE) in their Spamtraps from an IP-Address. This could be a result of a compromised email account, an Open Relay, or simply sending mass emails / marketing and not following best practices according to the "CAN-SPAM Act of 2003" (ref: https://en.wikipedia.org/wiki/CAN-SPAM_Act_of_2003)

Fabelsources Requires A Manual Delisting Request

This blacklist does support a manual request to remove or delist your IP Address from their database. Please note that removal requests that are submitted without addressing the core problem will likely result in your IP Address or Domain being relisted in that database, which can cause subsequent problems and extended listing periods without release.

More information about FABELSOURCES can be found at their website: http://www.spamsources.fabel.dk/

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