The mailbox providers that use Cloudmark for spam filtering are listed in the table below. This list was gathered from research and is not an exhaustive list.
Mailbox provider |
Country |
Singtel/Optus Online |
Australia |
Telstra Corporation Ltd |
Australia |
Telenet Thuis |
Belgium |
Tiscali, Belgium |
Belgium |
UPC; Belgium, Telenet (telenet.be) |
Belgium |
Universo Online |
Brazil |
Terra |
Brazil |
Inova.net |
Brazil |
Shaw Cablesystems |
Canada |
TELUS / Mail Operations |
Canada |
21CN Company Limited (China Telecom) |
China |
Sohu.com Inc. |
China |
Tencent / QQ Mail Operations |
China |
TDC A/S |
Denmark |
TDC Hosting |
Denmark |
Atos Worldline |
France |
France Telecom / Orange France |
France |
Renater |
France |
Virgin Mobile France, Tele2 France, SA |
France |
domainfactory GmbH |
Germany |
intergenia AG |
Germany |
Vodafone; Arcor AG & Co. KG |
Germany |
IBM Outblaze (IBM Lotus Live) |
Hong Kong |
KMS |
Hong Kong |
PCCW-HKT Network Services Limited (Netvigator) |
Hong Kong |
Bharat Sanchar Nigam (BSNL) |
India |
eircom Group plc |
Ireland |
Aruba S.p.A. |
Italy |
Fastweb SpA |
Italy |
Libero Mail |
Italy |
Tiscali S.p.A. |
Italy |
@NetHome Co., Ltd. |
Japan |
DTI (dream.jp) |
Japan |
NEC Biglobe Ltd. |
Japan |
NTT Group; Goo |
Japan |
OCN (Open Computer Network) |
Japan |
Otsuka Corporation |
Japan |
Sony So-Net Entertainment Corp. (so-net.ne.jp) |
Japan |
Mexis S.A. de C.V. |
Mexico |
Koninklijke KPN N.V. |
Netherlands |
KPN / XS4ALL Internet B.V. |
Netherlands |
Liberty Global Europe BV |
Netherlands |
Telfort (worldonline.nl) |
Netherlands |
TDC / TeleDanmark Internordia |
Norway |
Telenor / Tiscali AS |
Norway |
Pakistan Telecommunication Company Ltd. (PTCL) |
Pakistan |
ZAO Comstar-Direct |
Russia |
Vodacom Group Ltd |
South Africa |
INT Espana |
Spain |
TeleCable de Asturias, S.A.U. |
Spain |
Tele2 AB |
Sweden |
Bluewin |
Switzerland |
green.ch AG |
Switzerland |
Swisscom AG |
Switzerland |
Antel |
Trinidad |
AMEN Limited |
United Kingdom |
British Sky Broadcasting Group plc |
United Kingdom |
Cable & Wireless; THUS Plc (demon.co.uk) |
United Kingdom |
Claranet Limited |
United Kingdom |
PlusNet plc |
United Kingdom |
Talk Internet Ltd |
United Kingdom |
Tesco Telecom |
United Kingdom |
The Carphone Warehouse Group |
United Kingdom |
Virgin Mobile Group (UK) Limited |
United Kingdom |
Vodafone Group PLC |
United Kingdom |
Webroot / Email Systems Limited |
United Kingdom |
Armstrong Cable Services |
United States |
Atlantic Broadband |
United States |
BendBroadband |
United States |
Blue Ridge Communications, Inc. |
United States |
BlueTie, Inc. |
United States |
Bright House Networks, LLC |
United States |
CenturyLink / Digital Teleport, Inc (DTI) |
United States |
Charter Communications, Inc. |
United States |
Consolidated Communications Holdings Inc |
United States |
Cox Communications / Mail Operations |
United States |
DirecTV Broadband, Inc. |
United States |
Endurance International |
United States |
Facebook, Inc. - English |
United States |
Fusemail, LLC (Cincinnati Bell) |
United States |
Grande Communications, Inc. |
United States |
GVTC Communications |
United States |
Hickory Tech Corporation |
United States |
Liberty Technology Solutions |
United States |
Massillon Cable TV, Inc. |
United States |
Mediacom / Mail Operations |
United States |
Midcontinent Communications |
United States |
Rackspace Mail Operations (formerly MailTrust) |
United States |
Ritter Communications |
United States |
Southern Star Inc |
United States |
SureWest Communications |
United States |
TDS Telecom |
United States |
Time Warner Cable (Road Runner) |
United States |
TruVista Communications |
United States |
TWC Insight Communications |
United States |
Universal Cable Holdings, Inc. (DBA Suddenlink) |
United States |
Verizon Online / Mail Operations |
United States |
Windstream Communications (formerly Alltel) |
United States |
Wow! Technologies, Inc. |
United States |
XO Communications (xo.net) |
United States |