what does this sendmail message in Logwatch showing? hacking?

Hi. Can you help me to take a look what is mean by the following sendmail message in Logwatch
showing?? how the sendmail show this message?? how do they key in chenkai1`ms64.hinet.net ? And
also what is the forwarding error message?? I don't have /root/.forward file at all.

Forwarding errors:
/root/.forward.localhost: Group writable directory: 1 Times(s)
/root/.forward: Group writable directory: 1 Times(s)


From: root [mailto:root@xxxxxxxxxxxxxxxxxxxxx]
Sent: Tuesday, June 06, 2006 4:02 AM
To: root@xxxxxxxxxxxxxxxxxxxxx;
Subject: LogWatch for ssl1


################### LogWatch 4.3.2 (02/18/03) ####################
Processing Initiated: Tue Jun 6 04:02:01 2006
Date Range Processed: yesterday
Detail Level of Output: 0
Logfiles for Host: ssl1
################################################################

--------------------- sendmail Begin ------------------------

Unknown users:

chenkai1`ms64.hinet.net
from SSL1 [127.0.0.1] 1 time(s).


Forwarding errors:
/root/.forward.localhost: Group writable directory: 1 Times(s)
/root/.forward: Group writable directory: 1 Times(s)


################### LogWatch 4.3.2 (02/18/03) ####################
Processing Initiated: Tue Jun 6 04:02:01 2006
Date Range Processed: yesterday
Detail Level of Output: 0
Logfiles for Host: www3
################################################################

--------------------- sendmail Begin ------------------------

Unknown users:

believeworld0303
from localhost.localdomain [127.0.0.1] 2 time(s).

lichungchung
from localhost.localdomain [127.0.0.1] 1 time(s).




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