Subscribe-By-Email plugin: custom post types support

Hi there again! I've got a number of custom post types on libertyslibrary.com of which only 'Newsletters' (Alo Easymail plugin) gets listed by the wonderful Subscribe-By-Email plugin. The post types I really need in there I've created myself using the 'Custom Post TypesManager' plugin (which btw I can totally recommend to anyone).

I've done a search through the community questions but it seems this issue hasn't come up yet. Is there a way to get these post types noticed by SBE?

Thanks again fellow Pressies!

Nick