this can replace for sure any newsletter app

Absolutely! We use MailPoet on Wordpress to notify particular groups when new Blog posts are released to a specific category that they are interested in.

The same would be good here. Rather than having to create a campaign every time we add a new post, it would be great to have this triggered from a workflow which would pull in the new post header and image into the email and distribute it to the relevant list.

In case we have different groups following different topics, they would get the posts relevant to their area of interest. Maybe using Tags or some other way to group those contacts.

Thanks.