How to Enable and Use Exchange Online’s External Email Tagging Feature – blog by @12Knocksinna
How to Enable and Use Exchange Online’s External Email Tagging Feature – Office 365 for IT Pros (office365itpros.com)
How to Enable and Use Exchange Online’s External Email Tagging Feature – Office 365 for IT Pros (office365itpros.com)
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https://www.neowin.net/news/microsoft-announces-general-availability-of-email-otp-for-businesses
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