Hello :)
I hope you can forgive me a little advertisement: The English translation of my blog post on the Dovecot integration I did for the Univention Corporate Server (UCS) is online: https://www.univention.com/2015/07/dovecot-is-the-default-imappop3-mail-serv...
UCS is a Debian based Linux Distribution, everything - incl. management bits - is OSS. There is a "Core Edition" that you can download and use (also commercially) for free, that is - despite its name - feature complete: https://www.univention.com/downloads/ucs-download
A lot of interesting Dovecot features can be changed without breaking things, so this blog post may be interesting to everyone.
The German version can be found here: https://www.univention.de/2015/07/mailserver-dovecot-als-standard-imappop3-s...
Greetings Daniel Tröder