Add email aliases in bulk

Question

Hello

Please i need your help on this issue.

We added two domains to our tenant. Is it possible to add new aliases in bulk to ALL mailboxes using these two new domains? I know how to do it one by one, but this would take too much time. See below the article I am referring to.

https://learn.microsoft.com/en-us/microsoft-365/admin/email/add-another-email-alias-for-a-user?view=o365-worldwide&redirectSourcePath=%252fen-us%252farticle%252fAdd-additional-email-aliases-to-a-user-in-Office-365-0b0bd900-68b1-4bf5-808b-5d240a7739f4

Answer 1

hi,@IniobongNkanga-8038

Thanks for posting your question in the Microsoft Q&A forum.

If you don't want to manually add a new domain name alias for each user, we recommend that you use the Exchange Online PowerShell script.

1.Connect to Exchange Online

Connect-ExchangeOnline -UserPrincipalName youradmin@yourdomain.com

2.Get all user mailboxes：

$mailboxes = Get-Mailbox -ResultSize Unlimited

3.Loop through each mailbox and add the new aliases：

 foreach ($mailbox in $mailboxes)

 {

$newAlias1 = $mailbox.Alias + '@newdomain1.com'

$newAlias2 = $mailbox.Alias + '@newdomain2.com'

Set-Mailbox -Identity $mailbox.Identity -EmailAddresses @{add=$newAlias1,$newAlias2}

}

 Below is my test, I only make changes to two users.

Checked the user and found that the alias had been added

If my answer is helpful to you, please mark it as the answer so that other users can refer to it. Thank you for your support and understanding.