Jeff, petzl, Wazoo! Thank you very much for your answers and assistance!
Jeff, i didn't read e-mail messages sent to listed addressess. These e-mails owned by our provider's administrators and they didn't reroute SpamCop messages to me. Hope I'll take hot-fix from our local Microsoft support team next week and apply it as soon as possible.
With best wishes,
Dmitry Boolychev