Received quite a number of spams from a Singapore spammer. Actually had a complained from my upstream saying that it came from one of my servers. The spammer was selling education stuff and left his handphone number. The rest of the info, even domain name etc does not exist.
I called him and told him to stop, asking him which account is he using.
He told me he outsourced to a guy doing "serious biz", the guy refused to talk to me. We have about 30-50k accounts, checking can really hang the server. I called him 4 times trying to persuade him to talk, just want to ask him which account, is he our client and please stop. He refused flatly.
As a last resort I told him I am going to the local police. It is not a few emails but massive numbers doing a casual grep basically fill the entire screens and the upstream was breathing on me. Deadline passed and I report the case to the police.