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Step 1: Verify and Enable Domains (M365)
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Step 2: Update SPF Record (M365)
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Step 3: Sync Mailboxes with Azure Active Directory
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Step 3b: Set Up One-Click Message Pull (Plus Packages Only)
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Step 4: Configure M365 for Proofpoint
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Step 5: Test Mail Flow (M365)
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Step 6: Cut Over Mail Flow to Proofpoint (M365)
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Step 7: Lock Down M365 Environment