Knowledgebase
Why is SPF check failing with Office 365
Situation Emails being delivered to Office 365 are getting rejected do to SPF check. Office 365 is seeing the IP of Proofpoint Essentials as the sending server's IP.
Solution

1. Disable SPF check on Office 365

or

2. 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

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

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