Emails can be sent from Foliobook and can be seen in the email editor, however some people don't receive the images, instead they get blank areas in the email they receive. 

This is due to the way Foliobook attaches images, some email servers cannot process the images so the images are received from the emails.  In a future update we will alter how we attach images and that should cure the problem.

There is a separate issue with Gmail which cannot display some kinds of image attachments, instead it displays garbage. In this case, other email clients still work OK.