Corporate The Worst Hosting Networks (for Spam) By MailChannels | 2 minute read Spammers have long used ISP networks to send spam, taking ownership of PCs and mobile devices and using them to send spam. But in recent years, defenses against this type of spamming have improved remarkably, making this type of spamming much less effective and profitable. Not to be deterred, spammers have increased their focus on hosting providers, who offer powerful virtual private servers (VPS’es) not to mention compromise-able hosting accounts on large shared hosting machines. VPS boxes are easily obtained using stolen credit cards, and shared hosting accounts are easily compromised by guessing the password or via phishing attacks and other client compromises. So, which hosting networks are the world’s greatest sources of spam? Here are the latest figures as determined by our research using publicly available data from the Composite Blocking List (CBL): Name Country Volume Messages per Machine 1 CAT Telecom Thailand 5.9 8,499 2 1&1 Internet Germany 5.6 70,930 3 IBM Softlayer USA 4.5 7,120 4 Rackspace Hosting USA 2.7 17,172 5 Host Dime, Inc. USA 2.6 8,869 6 Hetzner Online AG Germany 2.2 2,835 7 Thaicom Thailand 2.1 58,972 8 Webfusion Internet Solutions UK 1.9 34,946 9 Vietnam Post and Telegraph Vietnam 1.9 5,249 10 Sadece Hosting Turkey 1.7 28,561 11 LeaseWeb Netherlands 1.6 3,300 12 Simply Transit Ltd. UK 1.4 15,915 13 IX Web Hosting USA 1.3 41,309 14 GigeNET, LLC USA 1.3 39,144 15 Strato AG Germany 1.3 23,930 16 Dualtec Informática S.A. Brazil 1.2 551,105 17 JaguarPC USA 1.2 32,282 18 TransIP Netherlands 1.1 40,439 19 Peer1 Canada 1.1 978 20 Telia Sonera Sweden 1.1 747 Need help securing your hosting company against spammers? Get in touch