This is the i-mscp guide to install dovecot and migrate from courier
.- The guide for dovecot 1.2 + quota on db (recomended) can be found here
Also I will try to keep here an updated copy of the imscp-dovecot-mngr (mandatory since there is password encryption) in this thread so It's easy to find and reference from other places.
The script allows to use usernames in capitals (some users would enter Test@example.com instead of email@example.com), remember that your mail_location should be something like
Dovecot related issues
changes in master.cf to improve dovecot user experience
This is a small patch so we don't have to manually do the changes i master.cf on every upgrade, it won't conflict on a courier installation
Increase default quota to 100MB
The default quota is currently 10MB, it only affects dovecot because courier is not able to deal with quotas in mailboxes.