post submission plugin?

Hello,
I’m searching a way/plugin that can enable visitors to submit a post to my site. I want to create a kind of submission form, and the post will be automatically published in the blog (maybe with some activation link sent to email).

I need to have something that this website is using:
https://letaroom.com/post/

If you happen to know any plugin that may help me, pls let me know! Thanks.