This build have all the components needed to deploy a mailserver,
webmail - roundcube postfix - ports 25 and 465 mysql - to Store and manage the accounts. AV - ClamAV postfixadmin - Webconsole to manage all the accounts. fail2ban- ( to block ssh access from dictionary attacks ). Dovecot - IMAPS and POPS Mailgraph - (To collect Statistics ). vnstat - This tool collects network statistics. Filesystem XFS ( I like this filesystem ).
TODO: Configure a replication across two servers using dovecot features.