It doesn't seem to matter. Actually getting domain ownership information is generally quite difficult now, because anyone with real DNS contact information wil

It doesn't seem to matter. Actually getting domain ownership information is generally quite difficult now, because anyone with real DNS contact information will get spammed (even spammed physically). Domain registrars have no requirement to care about spam from domains registered with them, and so generally don't care. Server owners will actually sometimes care, but it seems easy enough for spammers to find companies that don't. To add to this, if the spammers are in the US, unsolicited spam is essentially legally protected there. I've tracked down the actual US offices of some companies sending me clearly unsolicited spam with database-harvested information (usually sketchy loan offers to email addresses they could have only gotten through inappropriate means), but they can say they have an unsubscribe link and thus comply with CAN SPAM, and even if they don't, the act doesn't actually provide any recourse to individuals or small companies being spammed.