Iredmail

Iredmail is specially designed for deploying a fresh server system. It provides calendar service, contact service and antivirus. It is featured with many open source software that allows the users to fix bugs and update the used packages. It can work on both non-virtualized and virtualized boxes like VMware, Xen, KVM, etc. The mentioned utility store mail accounts in four backends including OpenLDAP, MySQL, MariaDB and PostgreSQL.