mail contact syntax

Question

Hi all,

I want to create a mail contact using Exchange Online PowerShell. Is the syntax below correct? Let's say my domain is contoso.com. I have an external user whose alias is someuser@somedomain.com. On my side, if I choose the alias as someuser.ext, will it create someuser.ext@contoso.onmicrosoft.com or someuser@contoso.com? I want it to be someuser@contoso.com.

New-MailContact  -FirstName "FN" -LastName "LN Ext" -DisplayName "FN-LN Ext" -Alias someuser.ext -ExternalEmailAddress someuser@somedomain.com

Answer 1

Hi, Roger Roger

With the command you provided, the syntax is correct through my tests, and I have successfully created a mail contact. The result is shown below.

When you create an alias for external users in your domain, the resulting email address typically follows the primary domain format that you set up for your organization in Microsoft 365.

If your primary domain is contoso.com, then the alias you create will often generate an email address like someuser.ext@contoso.com.

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