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Which mailbox providers and security vendors accept the Return Path Certification whitelist?

Due to confidentiality agreements with participating partners, we cannot share any type of list. However, we can give you more information about the Certification program and how it works. 

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. Some of the partners we can share are:

Mailbox providers

  • Microsoft
  • Yahoo
  • AOL
  • Comcast
  • Orange
  • Mail.ru

Anti-spam/security vendors

  • Cloudmark
  • SpamAssassin
  • Cisco Ironport

Many mailbox providers provide Certification benefits via their anti-spam or security vendor and may not directly participate in the Certification program.

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