How to HIDE a POST, without trashing it?

https://www.bewustzijnsvormen.nl

In order to send my newsletter with a nice but complicated format with the Sendit! plugin, I created a post of which I can ‘get the content’ directly into my newsletter.

I don’t want this post to show on my site, but it does appear automatically.

My site has a static homepage and all post show on the ‘agenda’ page. The post I created is now in the trash, because I don’t want it to show. But now I’m afraid I accidentally will erease it, or that the trash will be emptied automatically, and I don’t want to loose my post.

I think this could be sloved by the categories of my post, but I really don’t know how to get the Agenda page only to show the Agenda marked posts. I seems to be all or noting.

Any solution anyone?

Thanks so much!