Find Send-As rights on a mailbox

Here\’s a quick way to find out who has send-as permissions on a particular mailbox

Get-Mailbox -identity mailboxname | Get-ADPermission | where {($_.ExtendedRights -like “*Send-As*”) -and ($_.IsInherited -eq $false) -and -not ($_.User -like “NT AUTHORITY\\SELF”)} | FT -Wrap

You can also pipe in all mailboxes or a server or database to find out send-as permissions on all mailboxes as follows

Get-Mailbox | Get-ADPermission | where {($_.ExtendedRights -like “*Send-As*”) -and ($_.IsInherited -eq $false) -and -not ($_.User -like “NT AUTHORITY\\SELF”)} | FT -Wrap

Get-Mailbox -Server servername | Get-ADPermission | where {($_.ExtendedRights -like “*Send-As*”) -and ($_.IsInherited -eq $false) -and -not ($_.User -like “NT AUTHORITY\\SELF”)} | FT -Wrap