I am sure you know that when sending an email to windows live it will now show the pictures but it will instead display the following message in the alert bar:
Attachments, pictures and links in this message have been blocked for your safety.
However, I have seen some emails coming from some domains and I didn't need to do anything to display the images as it was displayed automatically.
How can I make sure emails going from my domain will be display the images automatically without showing the notification bar?