Hi Team,
User mailbox hosted in 0365 and mail user available in Exchange 2013 I need add additional email id in mailbox
Need add additional email id in bulk mailbox
Please share the script and Power shell cmd
Hi Team,
User mailbox hosted in 0365 and mail user available in Exchange 2013 I need add additional email id in mailbox
Need add additional email id in bulk mailbox
Please share the script and Power shell cmd
@satishchaturvedi-3719
I am writing here to confirm with you any update about this thread now?
If the suggestion below helps, please be free to mark it as an answer for helping more people.
You need to prepare a CSV for the mailboxes that you want to add email address to:

Then, you can use script below to add new email address to those mailboxes:
$Mailboxes = Import-Csv c:/temp/users.csv
foreach($Mailbox in $Mailboxes){
$temp = $Mailbox.Name
$temp2 = $temp +"@yourNewdomain.com"
Set-Mailbox $temp -EmailAddresses @{Add=$temp2}
}
You can use command below to check whether this new domain name add to your mailbox:
Get-Mailbox ex3user1 | fl EmailAddresses
Please note: If you want to add a new domain name for Exchange online mailbox, you need to verify this new domain in Office 365 first.
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