I was wondering if any one has a full system working with imap server + smtp server + roundcube (including virtual domains)
for examples: dovecout / courier + postfix + roundcube.
allthough i have no howto at hand (i do not remember where i took my setup from), i'm still able to help you with specific problems.
my setup includes:
i use roundcube for my personal email checking. our customers still use another client until roundcube reaches a certain stable level.
best regards, raoul bhatia