My site subscribers don't seem to receive blog post notifications/emails

Hi there, hoping someone can advise.

I've been trying to discover if subscribers to my site are receiving email notifications about new blog posts - I've added my own email address to the list and no emails seem to be coming through...

I've followed all the instructions I can find here in terms of ensuring that in the Blog settings the button is selected to allow subscribers to receive email notifications, yet nothing seems to happen.

Help!