Subscribe-by-email plugin not showing excerpt

Hi

For some reason, the notification emails sent by Subscribe-by-email does not contain any excerpt content. This area of the email is just completely blank.

While I can write my own function to try to do this, I see that it already was built to include a short excerpt of the post, but I am not sure why it is not showing.

Can someone tell me exactly which functions/classes gets invoked during the plugin workflow that generates the email content with the excerpt?

Thanks for your help