Postbox is described as 'Consolidate all your email accounts into a streamlined interface with powerful organizational tools for a clear, fast, and effective communication.'.
Here you can find the best alternatives to Postbox such as mailbird, Sendy.
Postbox caters to various platforms including Mac, Windows.
The best Postbox alternative is mailbird. Other great sites and apps similar to Postbox are Sendy. All applications here have either perpetual licenses or are one-time purchases.
