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Prerequisites

Microsoft 365 as MX Record
Google Workspace as MX Record
Cisco - Email security as MX Record
Cisco - Cisco as MX Record

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Source: https://developers.cloudflare.com/cloudflare-one/email-security/setup/pre-delivery-deployment/prerequisites/, from the Cloudflare Developer Docs. © Cloudflare, Inc., licensed under CC BY 4.0.

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