On 06/17/2016 09:35 PM, pa011 wrote:
As I am new to this business could somebody please give me a hint how to best handle such an abuse complain - possibly stop it?
You can explain Tor, offer to block that destination from your exit, and offer your help so they can treat Tor users differently in general. Teaching them that not all Tor users they will see are bad, and they should not outright block Tor, etc.
Often these reports are generated automatically by some intrusion detection systems and are purely informational.