printing problem (no remote images)

I have an email which (in the HTML version) includes a coupon.  I have  
downloaded the external images, but if I print the message, it prints  
without the images.  This is whether I print from the main window or  
open the message in a new window (and have to download the images  
again.)   Is there some config setting I've missed, or is this correct  
behavior, if unintended.

Thanks.

Jack