Powershell: Get Mailbox Permissions - only from ADUsers with a givenname + surname - powershell

Question

I need to make a CSV file with the name of the mailbox (mb Identity), user, accessrights and deny. But I only want to that for ADUsers who have a givenname AND a surname not only a surname.
I thought of something like that:
$File_Path = $args[0]
$File_Path = ((Get-Item -Path ".\" -Verbose).FullName) + "\" + $File_Path
$Utf8NoBomEncoding = New-Object System.Text.UTF8Encoding($False)
[System.IO.File]::WriteAllLines($File_Path, "Mailbox;RightHolder;Rights;Deny", $Utf8NoBomEncoding)
$Mailboxes = Get-Mailbox -ResultSize Unlimited
Foreach ($Mailbox in $Mailboxes) {
$mbPermissions = get-mailboxpermission $Mailbox
$str_DN = $Mailbox.DistinguishedName
$ad_obj = [ADSI]"GC://$str_DN"
Foreach ($mbPermission in $mbPermissions) {
If ($mbPermission.IsInherited -eq $False -and $mbPermission.User -notlike "NT-AUTORITÄT\SELBST") {
[System.IO.File]::AppendAllText($File_Path, "$($mbPermission.Identity);$($mbPermission.User);$($mbPermission.AccessRights);$($mbPermission.Deny)`r", $Utf8NoBomEncoding)
}
}
$ADPermissions = get-ADPermission $Mailbox.Identity
Foreach ($ADPermission in $ADPermissions) {
If ($ADPermission.ExtendedRights -like "Send-As" -and $ADPermission.User -notlike "NT-AUTORITÄT\SELBST" -and $ADPermission.Deny -eq $false) {
[System.IO.File]::AppendAllText($File_Path, "$($ADPermission.Identity);$($ADPermission.User);$($ADPermission.ExtendedRights);$($ADPermission.Deny)`r", $Utf8NoBomEncoding)
}
}
}
This works perfectly fine for creating the csv file with all credentials I need, but it doesn't exclude mailboxes from users who have no givenname. I'm a little bit stuck here.
Thanks for your help!
EDIT:
Solved it! Just put these lines instead of the $Mailboxes part:
$Mailboxes = get-mailbox -ResultSize Unlimited | select -ExpandProperty samaccountname
$Filter = foreach ($Obj in $Mailboxes) { get-aduser $Obj | select -property givenname,samaccountname }
$NoGivenName = $Filter | where { $_.givenname -ne $null } | select -ExpandProperty samaccountname
$BoxesFiltered = foreach ($Box in $NoGivenName) { get-mailbox $Box }

Answer 1

Can you try the following, it may take a little longer as the it has to filter out with a Get-ADUser to regenerate the list.
Import-Module ActiveDirectory
$File_Path = $args[0]
$File_Path = ((Get-Item -Path ".\" -Verbose).FullName) + "\" + $File_Path
$Utf8NoBomEncoding = New-Object System.Text.UTF8Encoding($False)
[System.IO.File]::WriteAllLines($File_Path, "Mailbox;RightHolder;Rights;Deny", $Utf8NoBomEncoding)
$Mailboxes = Get-Mailbox -ResultSize Unlimited
$Mailboxes = Foreach ($Mailbox in $Mailbox){ (get-aduser $mailbox | where { ([string]::IsNullOrEmpty($_.givenname) -eq $false) }).samaccountname }
Foreach ($Mailbox in $Mailboxes)
{
$mbPermissions = get-mailboxpermission $Mailbox
$str_DN = $Mailbox.DistinguishedName
$ad_obj = [ADSI]"GC://$str_DN"
Foreach ($mbPermission in $mbPermissions)
{
If ($mbPermission.IsInherited -eq $False -and $mbPermission.User -notlike "NT-AUTORITÄT\SELBST")
{
[System.IO.File]::AppendAllText($File_Path, "$($mbPermission.Identity);$($mbPermission.User);$($mbPermission.AccessRights);$($mbPermission.Deny)`r", $Utf8NoBomEncoding)
}
}
$ADPermissions = get-ADPermission $Mailbox.Identity
Foreach ($ADPermission in $ADPermissions)
{
If ($ADPermission.ExtendedRights -like "Send-As" -and $ADPermission.User -notlike "NT-AUTORITÄT\SELBST" -and $ADPermission.Deny -eq $false)
{
[System.IO.File]::AppendAllText($File_Path, "$($ADPermission.Identity);$($ADPermission.User);$($ADPermission.ExtendedRights);$($ADPermission.Deny)`r", $Utf8NoBomEncoding)
}
}
}