I noticed in part of the documentation there is a reference to getting exim and cyrus to work together. Sadly it calls deliver which isn't the optimal method having read recent posts. Try this delivery transport (you can use this in the localuser director instead of local_delibery):
local_lmtp: driver = smtp protocol = lmtp hosts_override hosts = localhost allow_localhost return_path_add Are there really people still using sendmail? ;-) I've been ditching it on any machine I've gone near for over 2 years now. Seems much faster, more flexible, and easy to administer than sendmail ever was. This is an observation by the way, not a call for a holy war ;-) james