How do I hide the “DisplayName” field?

Question

Hello, Our MS Exchange 2016 is served by two companies, i.e. two mail domains. At the same time, some employees have mailboxes configured in both domains. To avoid confusion when working with the address book, an advisory prefix was added to the properties of accounts in the “DisplayName” field for each company: Co1, Co2. The problem is that when letters are sent to external mail, for example to gmail, recipients see the company prefixes from the “DisplayName” field. Can you please tell me if it is possible to configure the mail server so that it does not transmit the contents of the “DisplayName” field to external mail servers?

Answer 1

Hi @Николай Щукин ，

You can consider running the command below to set the value of the "UseSimpleDisplayName" parameter to "$true":

Set-RemoteDomain "Default" -UseSimpleDisplayName $true  

By default no Simple Display Name is set for a user, so when -UseSimpleDisplayName is set to "$true", only the email address will show up for recipients on remote domains:

Reference: Set-RemoteDomain

Furthermore, you could also specify the Simple Display Name for users, so that the external recipients can see a different version of display name which doesn't include the company prefix. For scripts to add SimpleDisplayName for all users, you may refer to the blog below:
Using the SimpleDisplayName attribute for Exchange and Exchange Online in Office 365 with PowerShell
Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.

By following the article above, I made slight modification and tested in my lab using the following commands, it worked well at my end:

$users = Get-User -ResultSize Unlimited  
foreach ($user in $users) {  
$name=$user.DisplayName  
$SDN=[string]::Concat($user.FirstName.Trim()," ", $user.LastName.Trim())  
Set-User $user.Identity -SimpleDisplayName $SDN  
}  

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Answer 2

Thank! These settings did the trick.