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To send a post as an email without publishing it on the site, the email_only property must be set to true when publishing or scheduling the post in combination with the newsletter parameter: 
// PUT admin/posts/5b7ada404f87d200b5b1f9c8/?newsletter=weekly-newsletter
{
    "posts": [
        {
            "updated_at": "2022-06-05T20:52:37.000Z",
            "status": "published",
            "email_only": true
        }
    ]
}
When an email-only post has been sent, the post will have a status of sent.