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Which mailbox providers accept the Return Path Certification whitelist?

Return Path Certification covers 2.5 billion global inboxes, including those of three of the largest global mailbox providers as well as more than 80 others. 

Many of the mailbox providers and filtering companies using the Certification whitelist give senders delivery benefits, such as:

  • Allowing certified IP addresses to bypass gateway filters
  • Allowing greater sending or throttling limits
  • Giving a positive metric to help boost the IP reputation score 

The mailbox providers that use the Certification whitelist are shown in the following sections.

Global mailbox providers

  • AOL, Inc.
  • Microsoft - Outlook.com, Hotmail, Office 365
  • Yahoo!, Inc.

U.S. mailbox providers

  • AT&T Broadband with Yahoo!
  • BlueTie, Inc.
  • Cablevision Systems Corporation
  • CenturyLink, Inc.
  • Charter Communications, Inc.
  • Comcast Corporation
  • Cox Communications / Mail Operations
  • EarthLink, Inc.
  • Everyone.net
  • McAfee Labs
  • Network Solutions
  • Proofpoint, Inc.
  • Rackspace
  • RCN Corp.
  • Synacor, Inc.
  • Tucows (Open SRS)
  • United Online, Inc.
  • USA.NET, Inc.
  • Verizon Online

Canadian mailbox providers

  • Bell Canada; Sympatico
  • Eastlink
  • Hostopia
  • Manitoba Tel Allstream
  • Rogers Communications
  • Shaw Cablesystems
  • TELUS

European mailbox providers

  • British Sky Broadcasting LTD
  • Claranet Limited
  • Clearswift Limited
  • eircom Group plc
  • Fastweb SpA
  • Italia Online (Libero, Virgillio)
  • Koninklijke KPN N.V.
  • Laposte France
  • Mail.ru LLC
  • Names.co Limited
  • Onet.pl SA
  • Orange (France Telecom)
  • SkyNet a.s.
  • Swisscom AG
  • Talk Internet Ltd
  • Talk Talk
  • TDC A/S
  • Tele2 AB
  • Telefonica SA
  • Telenet
  • Telenor ASA
  • Telfort (worldonline.nl)
  • TISCALI SPA
  • Tiscali, Belgium
  • UPC
  • Vodafone GmbH
  • Vodafone Group PLC
  • Wirtualna Polska SA
  • XS4ALL
  • Yandex LLC

Asia-Pacific (APAC) mailbox providers

  • 21CN Company Limited (China Telecom)
  • Australia On Line PTY. LTD.
  • DTI (dream.jp)
  • IBM Outblaze (IBM Lotus Live)
  • J:COM NET(@NetHome/ZAQ)
  • NEC Biglobe Ltd.
  • NINEMSN PTY LIMITED
  • NTT Group; Goo
  • NTT Group; OCN
  • NTT Group; Plala
  • Opera Software S/A; FastMail Pty LTD
  • Singtel Optus Online
  • SK Communications; Nate.com
  • Softbank; BB Corp. (Yahoo Japan)
  • Sohu.com Inc.
  • Sony So-Net Entertainment Corp. (so-net.ne.jp)
  • Telecom New Zealand International
  • TELSTRA MEDIA PTY LIMITED
  • Tencent / QQ Mail Operations
  • TPG Internet Pty Ltd

Latin American mailbox providers

  • Internet Group do Brasil S/A.
  • Mexis S.A. de C.V.
  • Telmex
  • Terra
  • Universo Online SA

Security vendors

  • Cloudmark, Inc.
  • Kaspersky Lab Ltd.
  • Spam Assassin
  • Symantec
  • SpamCop
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