Apps similar to Citadel include Kolab, which is open source with a free version. Other options are Zimbra Collaboration Suite, hMail Server, Microsoft Exchange and OX App Suite. You can choose from more than 10 Mail Servers like Citadel for Linux, the web, Windows, self-hosting and Mac.
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.
China
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.
China
Xeams is a secure and powerful mail server for that includes a powerful spam filtering engine that eliminates up to 99% of junk email right out of the box. The software offers a flexible approach to email, making it a very user friendly server.
Hosted Exchange solutions from Netrepid - the best hosted exchange provider. Accelerate your technology at on demand speed.
Simple, easy and secure mail server with a convenient and simple interface. Automatic certificate renewal through Let’s encrypt. Redirect, local storage. IMAP and SMTP.
United States
