[Exim] SOS Error on local deliveries

Hi ,
Happy new year ,
i have set up an exim box for relay.
mails to external servers are delivered fine as excerpt below


2002-01-09 16:55:01 16OJC1-0000fW-00 <= essenyonjo@???
H=dhcp-56.africaonline.co.ug (test) [10.176.10.56] P=smtp S=730
id=CCEFIPONACFPNPFIHBAEAECLDNAA.essenyonjo@???
2002-01-09 16:55:05 16OJC1-0000fW-00 => jeddina@??? R=lookuphost
T=remote_smtp H=mx2.mail.yahoo.com [64.157.4.84]
2002-01-09 16:55:05 16OJC1-0000fW-00 Completed


but local mails to essenyonjo@??? will not go as below


2002-01-09 16:55:23 16OJCN-0000fd-00 <= essenyonjo@???
H=dhcp-56.africaonline.co.ug (test) [10.176.10.56] P=smtp S=763
id=CCEFIPONACFPNPFIHBAEEECLDNAA.essenyonjo@???
2002-01-09 16:55:23 16OJCN-0000fd-00 ** essenyonjo@???:
unknown local-part "essenyonjo" in domain "africaonline.co.ug"
2002-01-09 16:55:23 16OJCN-0000ff-00 <= <> R=16OJCN-0000fd-00 U=exim P=local
S=1659
2002-01-09 16:55:23 16OJCN-0000fd-00 Error message sent to
essenyonjo@???
2002-01-09 16:55:23 16OJCN-0000fd-00 Completed
2002-01-09 16:55:23 16OJCN-0000ff-00 ** essenyonjo@???:
unknown local-part "essenyonjo" in domain "africaonline.co.ug"
2002-01-09 16:55:23 16OJCN-0000ff-00 essenyonjo@???: error
ignored
2002-01-09 16:55:23 16OJCN-0000ff-00 Completed



any help will be highly appreciated.

rgds
Edward
EXIM NEWBIE