SmarterMail is described as 'offers many of the same features as Microsoft Exchange but has lower hardware requirements and reduced maintenance costs, resulting in a significantly lower total cost of ownership. A free version is available along with paid licensing' and is a Mail Server in the Office & Productivity category. There are five alternatives to SmarterMail for Windows, Online / Web-based, Self-Hosted solutions, Linux and Mac. The best alternative is hMail Server, which is both free and Open Source. Other great apps like SmarterMail are Microsoft Exchange Server (Paid), MailEnable (Freemium), OX Open-Xchange (Paid, Open Source) and Emails (Free).
Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft. It is part of the Microsoft Servers line of server products and is widely used by enterprises using Microsoft infrastructure solutions.