whois -h whois.geektools.com niab.se yields a referral to whois.nic-se.se, no names, a registrar status of REGISTRERAT, and a suggestion to use the web search for more info.

Looking at www.nic-se.se and doing a search, I get a holder of Norrlands Insekstaet AB.

But the From address makes me think it's spam. Can you post the full headers? My guess is that the Received: lines will never have been anywhere near Sweden.