Basic-Concepts
Web Servers
Uptime
Internet
Programming
Version Control
Configuration Management
Virtualization
Databases
Mail Servers
Domain Name Servers
Some useful links to explain the concepts of Dovecot
http://www.stefan-seelmann.de/wiki/mailserver-postfix-dovecot
http://wiki2.dovecot.org/FrontPage
http://bobcares.com/blog/dovecot-sendmail-perfect-mail-server/
https://www.digitalocean.com/community/tutorials/how-to-set-up-a-postfix-email-server-with-dovecot-dynamic-maildirs-and-lmtp
https://workaround.org/ispmail/squeeze/setting-up-dovecot