Dovecot Baikal Z-Push
From fakedWiki
Introduction
I was asked by somebody if i could share my configuration for Z-Push, which i am using with Dovecot as the IMAP backend and Baikal Server (v0.2.7, NOT 2.0) as the CardDAV and CalDAV backend.
Some of these configuration settings may be deprecated or renamed in the future, as Z-Push is constantly being improved, but they work fine right now (May 2015), and should give you a general guide how to get it running yourself.
I'll assume you already have working Dovecot and Baikal setups running, so i'll skip those parts and go straight to the Z-Push configurations.