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Microsoft Exchange Server 2013 Service Pack 1 (SP1)

I recently carried out a large migration and my customer had 700 Distribution Groups. My customer asked me to restrict delivery of emails to the groups by members only. So end users could not email the distribution group unless they were a member. 

So how do I do this for 700 users!! Powershell to the rescue.

Connect to Exchange Online via Powershell and run this command.

1. Get-Distributiongroup | export-csv C:\users\disti.csv
2. I then deleted all columns in the csv except for PrimarySmtpAddress and then renamed that column to distiname.
3. Then run this command
   Import-Csv “C:\Users\sofarrell\Desktop\disti.csv” | Foreach-Object{get-distributiongroup $_.distiName | Set-distributiongroup -AcceptMessagesOnlyFromDLMembers $_.distiname}
4. And then run this command
   Import-Csv “C:\Users\sofarrell\Desktop\disti.csv” | Foreach-Object{get-distributiongroup $_.distiName | Set-distributiongroup -AcceptMessagesOnlyFromSendersOrMembers $_.distiname}

I recently migrated a large Google Apps tenant to Microsoft Office365 (10k + users). Google require a verification code to set up forwarding to a user’s .onmicrosoft.com alias. Which means it is not possible to automate the forwarding from Google Apps to Office365.

So the way we enable co-existence is as follows.

Domain Name : Contoso.com 

1. Add an alias domain into Google Apps. Relay.contoso.com. Google state that this can take up to 24 hours. I have seen it complete in 10 hours. This will add an alias to all Google Apps users  user@relay.contoso.com
   
2. Export all Office365 user’s userprincipal names to a csv.
    
3. Enable forwarding for all users in Office365 to their smtpaddress@relay.contoso.com. This is done by using the following powershell command in Exchange Online.
   Import-Csv “C:\Users\sofarrell\Desktop\RelayAddress.csv” | Foreach-Object{Get-Mailbox $_.DisplayName | Set-Mailbox -ForwardingSMTPAddress $_.MailAddress -DeliverToMailboxAndForward $true} -verbose
   
4. When the last mailbox has migrated we then remove the forwarding and edit the delivertomailboxandforward value.
   Get-Mailbox | Set-Mailbox -ForwardingSmtpAddress $null -delivertomailboxandforward $false