What is the specific PowerShell command used to prevent external entities from sending emails to your tenant using your own domain names?
Why is it necessary to enable "Enhanced Filtering for Connectors" when you have already locked down your tenant to only accept mail from a third-party gateway?
If an organization enables RejectDirectSend $true but forgets to update their SPF record to include their legitimate third-party sending services, what is the likely impact on outbound mail delivery?
