How many mailboxes do we cover?

A lot! Hundreds of domains equal millions (even billions of mailboxes). Safe senders get improved delivery to 300 million inboxes. Certified senders receive improved delivery to over 2 billion inboxes. Here is the full list of ISPs, spam filters and other receiving entities.

Global	Certified
ISP or Filtering Technology	2 billion Inboxes
Cloudmark		Yes
Cloudmark / Bizanga		Yes
Microsoft		Yes
MySpace		Yes
SpamAssassin		Yes
Yahoo		Yes

United States	Certified
ISP or Filtering Technology
Armstrong Cable		Yes
Atlantic Broadband		Yes
Bend Broadband		Yes
Blue Ridge Communications		Yes
BlueTie		Yes
Bresnan		Yes
Buckeye Cablevision		Yes
Cablevision		Yes
Charter Communications		Yes
Cincinnati Bell		Yes
Comcast		Yes
Consolidated Communications		Yes
Cox Communications		Yes
Daum		Yes
Earthlink		Yes
Email Systems (Web Root)		Yes
Endurance		Yes
Enom		Yes
GVTC Communications		Yes
Godaddy.com		Yes
Grande Communications		Yes
Hickory Tech		Yes
Hostopia		Yes
HughesNet		Yes
Liberty Communications and Data Systems		Yes
Massillon Cable TV		Yes
McAfee/MX Logic		Yes
MediaCom		Yes
Midcontinent		Yes
Nuvox		Yes
Rackspace; Mailtrust		Yes
Ritter Communications		Yes
Southern Star		Yes
SuddenLink		Yes
Synacor		Yes
TDS		Yes
Time Warner Cable; Road Runner		Yes
TruVista		Yes
USA.net		Yes
United Online		Yes
Velocity Internet Services		Yes
Verizon		Yes
Virgin Mobile		Yes
Wow		Yes
XO Communications		Yes
Zoomtown		Yes

Canada	Certified
ISP or Filtering Technology
Bell Canada Includes: Aliant, sympatico.ca		Yes
Cloudmark Canada		Yes
Hotmail Canada		Yes
Rogers Communications		Yes
Spam Assasin Canada		Yes
Telus Includes: telus.ca, telusplanet.net; globetrotter.ca		Yes
Tucows; Open SRS		Yes
Yahoo Canada		Yes

EMEA	Certified
ISP or Filtering Technology
Abansys & Hostytec		Yes
Acens		Yes
Argo		Yes
Arrakis		Yes
Arysys		Yes
BT Includes: btintern.co.uk, btopenworld.com, talk21.com		Yes
Carphone Warehouse		Yes
Cesca		Yes
Clara.net		Yes
Clearswift		Yes
Comvive		Yes
Demon		Yes
Enter SRL		Yes
Euskatel		Yes
Fast Web		Yes
Foro Abuses - Red Iris		Yes
Hostalia		Yes
Ibercom		Yes
Infortelecom		Yes
Jazztel		Yes
KPN Includes: freeler.nl, hetnet.nl, planet.nl, wxs.nl		Yes
Liberty Global		Yes
Names.co.uk		Yes
OLS		Yes
Ono		Yes
Orange Spain		Yes
Sarenet		Yes
Soluciones Dinámicas en Red		Yes
Swisscom		Yes
TDC		Yes
TalkTalk; Tiscali UK		Yes
Tele2		Yes
Telecable		Yes
Telefonica España		Yes
Telekom Austria		Yes
Tiscali, Italy		Yes
XS4ALL		Yes
Ziggo		Yes

Australia	Certified
ISP or Filtering Technology
Australia OnLine		Yes
Fastmail AU		Yes
Microsoft Australia - ninemsn.com		Yes
Yahoo!7 Australia		Yes

China	Certified
ISP or Filtering Technology
Sohu.com		Yes
Tencent (QQ); qq.com		Yes

Brazil	Certified
ISP or Filtering Technology
Cloudmark Brazil		Yes
Microsoft Hotmail Brazil Includes: hotmail.com, msn.com		Yes
Spam Assassin Brazil		Yes

- Coverage provided through partnership with Cloudmark.

- Coverage provided through partnership with Foro Abuses.

- Coverage provided through partnership with Spam Assassin.