Sleekplan comes with a default email layout and contents. But what's about using your own?

Create custom email templates & layouts!: We have shipped an update to our email service, that allows you not only to customize the layout of the email, but also to change the content according to your requirements. So that your emails fit in your brands' tone and style!

You can modify any of Sleekplan's customer-facing pre-made templates. Try it here: Settings > Email > Templates (Business Plan required)