mwardm
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AdminMicrosoft 365 Groups Feedback
(Product Owner, Microsoft Office 365)
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Disabling the welcome mail is possible with an extra parameter in the Set-UnifiedGroup cmdlet in Exchange PowerShell: -UnifiedGroupWelcomeMessageEnabled:$false. See https://docs.microsoft.com/en-us/powershell/module/exchange/users-and-groups/set-unifiedgroup
Use this as a part of a custom group creation flow if you would like to restrict and/or customize the welcome mail for many groups across your tenant.
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For prevening this via Powershell, see https://techcommunity.microsoft.com/t5/Office-365-Groups/How-to-remove-the-Welcome-Message-when-a-new-member-joins-a/td-p/56573