Alex has already done the hard work for this which works well
Exchange Online Distribution List Migration Script | A blog about automation and technologies in the cloud (alexholmeset.blog)
I changed the script as the Source tenant had multiple domains and also stoped 365 Groups with the same name causing issues
#Connect with source tenant
Connect-AzureAD
#Connect with destination tenant
Connect-ExchangeOnline
#Dist Groups list in array "1","2"
$DL = "1","2"
$ZSourceDomain = "sourcedomain.com"
$CSourceDomain = "sourcedomain2.com"
$DestinationDomain = "destinationdomain3.com"
foreach($D in $DL){
$List = @()
$List = Get-AzureADGroup -SearchString "$D"
#Remove office 365 Groups with same name , using SPO as identifier
$List = $list | ?{$_.proxyaddresses -match '.*SPO.*'}
$ZListMembers = @()
$ZListMembers = Get-AzureADGroupMember -ObjectId $List.ObjectId | Where-Object {$_.UserPrincipalName -like '*$ZSourceDomain'}
$ZListMembersUPN = @()
$ZListMembersUPN = $ZListMembers.UserPrincipalName
$CListMembers = @()
$CListMembers = Get-AzureADGroupMember -ObjectId $List.ObjectId | Where-Object {$_.UserPrincipalName -like '*$CSourceDomain'}
$CListMembersUPN = @()
$CListMembersUPN = $CListMembers.UserPrincipalName
New-DistributionGroup -Name $List.DisplayName -Description $List.Description -PrimarySmtpAddress $($List.MailNickName+"@$DestinationDomain")
foreach($ZListMemberUPN in $ZListMembersUPN){
Add-DistributionGroupMember -Identity $List.DisplayName -Member $ZListMemberUPN.replace("$ZSourceDomain","$DestinationDomain")
}
foreach($CListMemberUPN in $CListMembersUPN){
Add-DistributionGroupMember -Identity $List.DisplayName -Member $CListMemberUPN.replace("$CSourceDomain","$DestinationDomain")
}
}
Lets Export all Distribution settings from Source Tenant
#Connect with source tenant
Connect-ExchangeOnline
Get-DistributionGroup -RecipientTypeDetails MailUniversalDistributionGroup | Export-Csv -Path “C:\Temp\dGroupsall.csv"
Lets Import and Set what we need to the Destination Tenant
This script does RequireSenderAuthenticationEnabled ( Delivery Restrictions ) , Owner ( ManagedBy ) and MemberJoinRestriction. You can add any new ones you would like to set from the Sheet
#Connect with destination tenant
Connect-ExchangeOnline
Import-Csv -Path "C:\Temp\dGroupsall.csv" | ForEach-Object {
#Lets do this one by one incase one fails it doesn’t block other
#We need to convert the csv value to boolean to write to RequireSenderAuthenticationEnabled
[boolean] $RequireSenderAuthenticationEnabled = [system.convert]::toboolean($_.RequireSenderAuthenticationEnabled)
Set-DistributionGroup -Identity $_.Alias -RequireSenderAuthenticationEnabled $RequireSenderAuthenticationEnabled
Set-DistributionGroup -Identity $_.Alias -ManagedBy $_.ManagedBy
Set-DistributionGroup -Identity $_.Alias -MemberJoinRestriction $_.MemberJoinRestriction
}
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