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Proofpoint, Inc.

Why is SPF check failing with Office 365

Situation Emails being delivered to Office 365 are getting rejected due to SPF check. Office 365 is seeing the IP of Proofpoint Essentials as the sending server's IP.
Solution
  • Disable SPF check on Office 365

or

  • Add SPF record as recommended by Microsoft

 

Disable SPF check on Office 365

The setting is located at Exchange admin Center > protection > spam filter > double click Default > advanced options > set SPF record: hard fail: off

 

Add SPF record as recommended by Microsoft

Microsoft suggests that the SPF of Proofpoint Essential gets added to the domain's SPF

Customers on US DC (US1, US2, US3, US4) SPF:

"v=spf1 a:dispatch-us.ppe-hosted.com ~all" 

Customers on EU DC (EU1) SPF:

"v=spf1 a:dispatch-eu.ppe-hosted.com ~all"