|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.|
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"