5 Swedish companies have the monopoly of relaying spam, distributed from Sweden.

Though they may be designed for good, there’s nothing keeping spammers from using VPN and other anonymising services to their advantage as well. VPN companies help international spammers with an informal but cheap and efficient botnet.

Concerned by their anonymity, spambots, criminals and content scrappers hide their original IP addresses behind proxy servers also know as “proxies”. Proxies are characterized by their diversity: malwares hijacking your computer for a few minutes, bug in an anti-virus update mechanism, Tor exit or VPNs

http://www.i-love-spam.com/spam-distributed-from-sweden-5-swedish-companies-have-the-monopoly/