With the Automated addon, you can create a channel with a newsletter template configured to extract and include the latest posts, if new ones have been added after the last newsletter has been sent.
This channel can be set to be activated every hour: if new content has been added in the last hour a newsletter is created and delivered.
Please note: this is different than generating a newsletter every time a post is published but it is safer since the channel is able to check if a delivery is still undergoing and delay the next newsletter to avoid overcharging the server.
Of course, if new posts are published with different publishing hours a newsletter is generated for each single post. If you need to create many posts in a row, within a few minutes’ distance, the template can be configured to include them all.