[exim] Sharing mta

Hi,

I'm trying to share a single Exim smtp daemon on the host node on multiple
virtual servers (openvz containers). Users in containers should only be
able to send emails. What I have done so far is sharing the mail spool
directory on the host node with all containers. However, when a message is
sent inside a container it is not processed until runq on the host node is
ran. So what does Exim's "receiving process" do to tell the daemon it
should process the queue?

Thanks.

Regards,

Lennart Ackermans