[exim] Error Exim4 Unrouteable address

I'm testing exim4 in Debian when i send a mail to local user I get a error
in mainlog : "Unrouteable address"

2006-02-13 09:50:57 1F8fy0-0000hh-25 <= root@??? U=root
P=local S=406
2006-02-13 09:51:07 1F8fy0-0000hh-25 ** root@???: Unrouteable
address
2006-02-13 09:51:17 1F8fyv-0000hn-Ef <= <> R=1F8fy0-0000hh-25 U=Debian-exim
P=local S=1271
2006-02-13 09:51:17 1F8fy0-0000hh-25 Completed


I run this command, too:

exim -v -bt duke12

and i get next message:


root@localhost is undeliverable:
Unrouteable address


Any idea...........?? thanks

--
L.I. José Alberto López Razo
Tel. Part: 01-735-3942890
Tel. Cel: 777-1911520
TEP: www.mi-zona.com.mx/010AAAW
yahoo: razo_duke12@???
Blog: http://razoduke12.blogspot.com/
Fotos: http://www.flickr.com/photos/18613843@N00/