Mailsite is described as 'MailSite Email Servers provide high quality,easy to use email solutions for businesses, enterprises and service providers that require secure, scalable email hosting software with integrated anti-spam, anti-virus,content filtering & attack prevention' and is a Mail Server in the Office & Productivity category. There are more than 10 alternatives to Mailsite for Online / Web-based, Windows, Linux, Self-Hosted solutions and SaaS. The best alternative is Zoho. It's not free, so if you're looking for a free alternative, you could try Nextcloud Hub or OpenChange. Other great apps like Mailsite are Microsoft 365 (Paid), Microsoft Exchange Server (Paid), IceWarp (Paid) and iMail (Paid).
Nextcloud is the most deployed on-premises file share and collaboration platform. Access & collaborate across your devices. As fully on-premises solution, Nextcloud Hub provides the benefits of online collaboration without the compliance and security risks.
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.
IceWarp integrates all communication & collaboration features in one unified solution. Available in cloud or for on-premises deployment, IceWarp is a great tool to share and exchange all information and ideas online, offline or via mobile devices.
Fast, safe, heavy mail solution. Web-client access, LAN or WAN self-hosted server, maintenance-free design. No Windows server and database server required, unlimited mail accounts, storage, attachment size, custom logo. Free for commercial use.
Sanwhole Exchange is a server running iMail, iPress and iStore services. iMail is an enterprise-class email server does Microsoft Exchange and Gmail work. iPress sets blog, forums and tickets in one. iStore is an online store.
Zendo is a platform that lets businesses handle customer requests in one place. Zendo helps sell bespoke services online; saves time by reducing context switching, manual and repetitive tasks, or managing customer communications.