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Update-EmailAddressPolicy

Use the Update-EmailAddressPolicy cmdlet to apply new or updated email address policies to the affected recipients in an on-premises Exchange organization. Exchange PowerShell reference

From the Exchange PowerShell reference 6 parameters Its page in the reference

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Parameters

6 in the Exchange PowerShell reference
-IdentityThe Identity parameter specifies the email address policy that you want to apply to recipients.
-Confirm, -cfThe Confirm switch specifies whether to show or hide the confirmation prompt.
-DomainControllerThe DomainController parameter specifies the domain controller that's used by this cmdlet to read data from or write data to Active Directory.
-FixMissingAliasThe FixMissingAlias switch repairs recipients that don't have an alias.
-UpdateSecondaryAddressesOnlyThe UpdateSecondaryAddressesOnly switch specifies that only the proxy email addresses are updated for the recipients.
-WhatIf, -wiThe WhatIf switch shows what the command does without making any changes.