The new daemon interface for Mercury/32 opens a lot of new possibilities, including the event daemon type, that allows direct interaction with how a message is processed by a Mercury module. As an experiment I've created this daemon to extend the functionality of how RCPTs are handled by the Mercury SMTP server:
http://community.pmail.com/files/folders/community_add-ons_for_mercury/entry10133.aspx
Please note that the daemon at present is useful only if you want to allow reception of messages for unknown local addresses. I expect the use will be extended later on, though.
/Rolf