Bulk add email alias to all AD user accounts

Question

We are preparing to change our domain name. The first step is to add an email alias to all user accounts. We use Azure AD Connect to sync our AD accounts with M365.

I need to add an email alias to all our users.

example:

Primary: ******@domain1.com

Alias: Add ******@domain2.com

The alias should be based on the existing user account... In the example, user1@.

I am hoping that I don't have to edit each user account proxy address individually.

Thanks.

Answer 1

The below should help you out, fix as you will!

If you find this helpful, please mark it as the answer, Regards Bz

#Get all Ad users
$users = Get-ADUser -Filter * -Properties EmailAddress, proxyAddresses

#loop through each user
foreach ($user in $users) {
    $newAlias = $user.EmailAddress -replace '@domain1.com', '@domain2.com'
    
    # Update the proxyAddresses attribute
    Set-ADUser $user -Add @{proxyAddresses = "smtp:$newAlias"}
}
# Check the updated proxyAddresses for a specific user
(Get-ADUser -Identity 'User1' -Properties proxyAddresses).proxyAddresses

#Sync up with Azure AD
Start-ADSyncSyncCycle -PolicyType Delta

Answer 2

Here you go:

# Get a specific AD user by their username
$user = Get-ADUser -Identity 'User1' -Properties EmailAddress, proxyAddresses

# Generate the new email alias
$newAlias = $user.EmailAddress -replace '@domain1.com', '@domain2.com'

# Update the proxyAddresses attribute for that user
Set-ADUser $user -Add @{proxyAddresses = "smtp:$newAlias"}

# Check the updated proxyAddresses for the specific user to verify
$updatedUser = Get-ADUser -Identity 'User1' -Properties proxyAddresses

$updatedUser.proxyAddresses

#Sync up the AD (optional)
Start-ADSyncSyncCycle -PolicyType Delta