Quick-and-dirty Catch-All Mailbox for GCC Channel Meeting Invitations

Quick-and-dirty Catch-All Mailbox for GCC Channel Meeting Invitations

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It’s well-known that our Government Community Cloud instance of Office 365 doesn’t support emailing a channel.  This can be problematic when you are attempting to schedule a channel meeting and include recipients not on the platform.  What ends up happening is the recipient can actually receive an NDR (because they can’t send the meeting acceptance back to the channel).

To get around this, you can create a catch-all mailbox to capture the meeting responses using three quick PowerShell cmdlets from Exchange Online:

New-Mailbox -Shared -Alias 'catchall' -Name "Catch-All Mailbox" -DisplayName "Catch-All Mailbox" -Force
New-DynamicDistributionGroup -Name 'AllMailboxes' -Alias 'AllMailboxes' -OrganizationalUnit $null -IncludedRecipients 'MailboxUsers'
New-TransportRule -FromScope 'NotInOrganization' -RedirectMessageTo 'catchall' -ExceptIfSentToMemberOf AllMailboxes -Name 'AllMailboxes' -StopRuleProcessing:$false -Mode 'Enforce' -Comments 'Catch-all mailbox rule' -RuleErrorAction 'Ignore' -SenderAddressLocation 'Header'

That’s it. That’s the post. 🙂


Published by Aaron Guilmette

Helping companies conquer inferior technology since 1997. I spend my time developing and implementing technology solutions so people can spend less time with technology. Specialties: Active Directory and Exchange consulting and deployment, Virtualization, Disaster Recovery, Office 365, datacenter migration/consolidation, cheese.

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