In the latest release from Devil-Linux the lmtp is missing from postfix. lmtp is de documented way to use Postfix en Cyrus IMAP.
The lmtp protocol is implemented by de smtp daemon. But there needs to by a link from lmtp to smtp.
So a simple ‘ln –s smtp lmtp’ in /usr/libexec/postfix will fix everything.
I build a custom CD with the extra link and lmtp to cyrus works as documented.