When you want an overview of all the Send-As permissions configured on all the mailboxes in your environment, you can use the following command in the Exchange Management Console.
Get-Mailbox | Get-ADPermission | where {($_.ExtendedRights -like “*Send-As*”) -and -not ($_.User -like “NT AUTHORITY\SELF”)} | Ft -wrap
When you want the Send-As permissions configured on one specific mailbox, you can add the -identity switch. For example:
Get-Mailbox -identity systeembeheer | Get-ADPermission | where {($_.ExtendedRights -like “*Send-As*”) -and -not ($_.User -like “NT AUTHORITY\SELF”)} | Ft -wrap
