You can see a preview and the performance details for a previous version of your blog notification emails from the email tool.
In your HubSpot account, navigate to Marketing > Email.
Find your blog notification email. Click the Email type dropdown to filter for Blog, then click on the name of the email you'd like to view.
The email details page will show you the performance details for the most recent send of the notification email by default. At the top of the page, click the Blog publish time dropdown menu to select another previously sent email.
The details page will refresh with an email preview and performance data for the blog notification email selected.