SUBSCRIBE BY EMAIL PLUGIN NOT WORKING WITH CUSTOM POST TYPE

Subscribe by Email plugin not working with custom post type. I setup a custom post type and the emails get set only when I post a standard post but not when I post something from the custom post type. my entire site is private and only viewable by subscribers. The post does show up on the page its supposed to just no notification email is sent. I made the custom post type with POST TYPE BUILDER from THEMIFY.me . Is there something I am doing wrong or is there maybe another plugin that I can use for this that you recommend?