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Suggestions:

Have one or two sentences in larger type making the case for why TaskMail fresh instead of just listing the features and relying on visitors to put the pieces together.

The screenshot is also pretty plain and looks similar to many applications. You may want to consider zooming in a bit so visitors don't glaze over it as just a multi-panel view.

If the main pitch is that it's just like using email for users, maybe show gifs/images of Outlook/Google email workflow alongside TaskMail equivalents to demonstrate it.