Hi @houba_houbi,
Yes because we need to see the article in the real view and modify it if necessary. So if it is automatically send before seeing it it’s a problem.
Unfortunately, that would be difficult to achieve if you have a Post Notification email set up.
That’s why if you edit this email you’ll see posts displayed there even if there’s no newly published post. They’re are just for illustrative purposes so you can preview what future posts will look like.
If there’s anything you need to change in the posts included in your newsletter before sending it, I’d suggest creating a standard newsletter and sending it manually instead.