lmtp

How is it possible to deliver email from qmail to a LMTP server?

I have a qmail server, which cannot be changed into anything else, because it is part of a much larger system. It should route all emails to a Zarafa server, which only uses the LMTP protocol and to which I don't have physical access. How is it possible to make qmail deliver the emails to the LMTP server? ...