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Exchange Online
A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.
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Hello Mbali Vilakazi,
Thank you for posting in Q&A forum.
Based on your description, if you want to configure an external postmaster address, you can only use Exchange Online PowerShell to perform this process.
Reference links: Configure the external postmaster address in Exchange Online | Microsoft Learn
I hope the information above is helpful.
Best Regards,
Yanhong Liu
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