Forum Discussion
Migrate mailbox to another domain same Tenant
Hi, In our company, we bought a new domain and we want to move all of our existing mailboxes to the new one. I already have both domains registered in the same tenant. I mean mailto:support@co...
EvilSecurityFellow
A)
You have a tenat X and you are NOT going to setup a new tenant but just register a DOMAIN in the existing tenant x and want to change the UPN so that the users receive mail with the new Domain name?
exactly i want to do as you mentioned on point (A)
A)
You have a tenat X and you are NOT going to setup a new tenant but just register a DOMAIN in the existing tenant x and want to change the UPN so that the users receive mail with the new Domain name?
exactly i want to do as you mentioned on point (A)
Hi gteibo1,
Change the UPN with Powershell:
# Define the new UPN suffix
$newUPNSuffix = "new-domain.com"
# Connect to Azure AD
Connect-AzureAD
# Get all users in Azure AD
$users = Get-AzureADUser -All $true
# Loop through each user and update their UPN
foreach ($user in $users) {
# Extract the username part from the current UPN
$username = ($user.UserPrincipalName).Split('@')[0]
# Construct the new UPN
$newUPN = "$username@$newUPNSuffix"
# Set the new UPN
Set-AzureADUser -ObjectId $user.ObjectId -UserPrincipalName $newUPN
}
Write-Host "UPNs have been updated for all users."
After hat change der primary SMTP address:
# Define the new primary SMTP domain
$newPrimarySMTPDomain = "newdomain.com"
# Get all mailboxes
$mailboxes = Get-Mailbox -ResultSize Unlimited
# Loop through each mailbox and update the primary SMTP address
foreach ($mailbox in $mailboxes) {
$currentPrimarySMTP = $mailbox.PrimarySmtpAddress
$newPrimarySMTP = $mailbox.UserPrincipalName.Replace('@', "@$newPrimarySMTPDomain")
# Set the new primary SMTP address
Set-Mailbox -Identity $mailbox.Identity -PrimarySmtpAddress $newPrimarySMTP -EmailAddressPolicyEnabled $false
Write-Host "Changed primary SMTP address for $($mailbox.DisplayName) from $currentPrimarySMTP to $newPrimarySMTP"
}
Write-Host "Primary SMTP addresses have been updated for all mailboxes."
Change the UPN with Powershell:
# Define the new UPN suffix
$newUPNSuffix = "new-domain.com"
# Connect to Azure AD
Connect-AzureAD
# Get all users in Azure AD
$users = Get-AzureADUser -All $true
# Loop through each user and update their UPN
foreach ($user in $users) {
# Extract the username part from the current UPN
$username = ($user.UserPrincipalName).Split('@')[0]
# Construct the new UPN
$newUPN = "$username@$newUPNSuffix"
# Set the new UPN
Set-AzureADUser -ObjectId $user.ObjectId -UserPrincipalName $newUPN
}
Write-Host "UPNs have been updated for all users."
After hat change der primary SMTP address:
# Define the new primary SMTP domain
$newPrimarySMTPDomain = "newdomain.com"
# Get all mailboxes
$mailboxes = Get-Mailbox -ResultSize Unlimited
# Loop through each mailbox and update the primary SMTP address
foreach ($mailbox in $mailboxes) {
$currentPrimarySMTP = $mailbox.PrimarySmtpAddress
$newPrimarySMTP = $mailbox.UserPrincipalName.Replace('@', "@$newPrimarySMTPDomain")
# Set the new primary SMTP address
Set-Mailbox -Identity $mailbox.Identity -PrimarySmtpAddress $newPrimarySMTP -EmailAddressPolicyEnabled $false
Write-Host "Changed primary SMTP address for $($mailbox.DisplayName) from $currentPrimarySMTP to $newPrimarySMTP"
}
Write-Host "Primary SMTP addresses have been updated for all mailboxes."