We updated the News Central web part in SharePoint to support opening posts from Newsletters, New Post notification and Post Reminder emails. This update resolves an issue with Newsletters where the "See All News" button would open to a blank View a Post page. Here's how to start using the new functionality:
Add the "Post Central" web part to any desired page
Edit the web part and enable the "Preload post if available" toggle and republish the page
In the "Sparrow Management" web part, click settings and change the "URL to Open Post in SharePoint" field to the desired page with the updated "Post Central" web part. For example: