Sorry. Great idea, but AFAIK the cyrus lmtpd is activated on demand by
the cyrus master process. But I can verify, that either the unix- or the
tcp socket are there. And the unix socket is writeable by the opensmtpd
Additionally, I believe the error message from smtpd to be pretty clear
about mail.lmtp not being found.
But of course, as this may be a follow up error, I will try to verify
the lmtp socket with postfix.