Based on the links zrail mentioned, it looks like it is just a standard for sending abuse reports. The RFC looks pretty comprehensive, but there is also more in

Based on the links zrail mentioned, it looks like it is just a standard for sending abuse reports. The RFC looks pretty comprehensive, but there is also more information at https://en.wikipedia.org/wiki/Abuse_Reporting_Format https://en.wikipedia.org/wiki/Abuse_Reporting_Format.