Private/Security/Test-O365DomainTenantName.ps1
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function Test-O365DomainTenantName { [CmdletBinding()] param ( [Parameter()] $DomainData ) $isOffice365Tenant = Test-ExchangeOnlineDomain $DomainData if ($isOffice365Tenant -eq 'No') { return "N/A" } $lowestPreferenceMX = $DomainData.MX | Where-Object { $_.NameExchange -ne $null } -ErrorAction SilentlyContinue | Sort-Object -Property Preference | Select-Object -First 1 -ErrorAction SilentlyContinue $nameExchange = $lowestPreferenceMX | Select-Object -ExpandProperty NameExchange -ErrorAction SilentlyContinue if ($nameExchange -eq $null) { return "Undetermined" } if ($nameExchange.Contains('mail.protection.outlook.com')) { $record = $nameExchange | Where-Object { $_ -like '*.mail.protection.outlook.com' } | Select-Object -First 1 if ($record) { $record.Replace('.mail.protection.outlook.com', '') } } else { return "Undetermined" } } |