[Exim] Exim & Cyrus

Hi:

I have exim 3.22 and Cyrus 2.0.12 IMAP server installed on our RH Linux7.1
box and I want all mail delivered to the cyrus imap server. I've added

local_delivery:
driver = pipe
command = "/usr/cyrus/bin/deliver ${local_part}"
user = cyrus
return_output
log_output
prefix =
suffix =


localuser:
driver = localuser
transport = local_delivery


to exim.conf, but delivering mail to the cyrus server doesn't work. I keep
getting:
localuser director declined for cyrususr: no such user

What else is needed to have mail delivered to cyrus imap server?

TIA,

Üllar