Poste.io is described as 'Full featured email server built in docker with free plan' and is a Mail Server in the Online Services category. There are more than 10 alternatives to Poste.io for a variety of platforms, including Windows, Self-Hosted solutions, Linux, Online / Web-based and BSD. The best alternative is mail.com, which is free. Other great apps like Poste.io are Zimbra Collaboration Suite (Freemium, Open Source), hMail Server (Free, Open Source), Mail-in-a-box (Free, Open Source) and iRedMail (Freemium, Open Source).
Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more. With the most innovative web application available today, Zimbra boosts the productivity of users on any desktop and dramatically reduces TCO compared to legacy platform vendors.
A fully fledged, free email server solution, an open source project (GPL v2). Use official binary packages from Linux/BSD distributions, with both i386 and x86_64 support. Easy, fast deployment in LESS THAN 1 MINUTE. View YouTube Video to check how easy it is.
iRedMail vs Poste.io opinions
pros, cons and recent comments
Neoh One-click installer for email on your own web server.
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.
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.