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How to Allow Specific Domains and Block All Other Emails in Microsoft 365 Using Mail Flow Rules (Step-by-Step Guide)

📅 28 Dec 2025

his detailed technical guide explains how to allow email communication only with specific domains and block all other domains in Microsoft 365 Business Basic, using Mail Flow (Tran…

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How to Allow Specific Domains and Block All Other Emails in Microsoft 365 Using Mail Flow Rules (Step-by-Step Guide)

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