how to run dovecot imap on separate server from postfix?

[Robert Fantini]

Hello

 we are using version 2.2.13 on debian.

 currently imap  runs on the same system as  postfix , spamassassin and
other mail related software.

 I'd like to move dovecot imapd  and mail storage  to its own system.

 I've search google and wiki and could not see how to do so.

 could someone please point me in the direction to that done?  I like
reading documentation..

here is more info on our set up:

postfix:
# grep dovecot /etc/postfix/*
/etc/postfix/main.cf:mailbox_transport = lmtp:unix:private/dovecot-lmtp
/etc/postfix/main.cf:smtpd_sasl_type = dovecot

kind regards
Rob Fantini