sendmail problem

[Sebastian Wild <sw@cronon.org>]

Hi List,

I got a little sendmail problem.
Set up a sarge box for a customer. Installed sendmail onto it.
Now usually I could send mails from the console with it without 
configuring anything (except network of course *g*)
Now on this box it keeps failing :(
Error message is:
Can't send mail: sendmail process failed with error code 67

In /var/log/mail.log it says:

Oct 15 07:59:40 povoden sendmail[5532]: i9F5xe3s005532: from=root, 
size=57, class=0, nrcpts=1, msgid=<200410150559.i9F5x
e3s005532@povoden.cronon.org>, relay=root@localhost
Oct 15 07:59:41 povoden sm-mta[5533]: i9F5xe0p005533: <sw@cronon.org>... 
Unrecognized host name cronon.org.
Oct 15 07:59:41 povoden sendmail[5532]: i9F5xe3s005532: 
to=sw@cronon.org, ctladdr=root (0/0), delay=00:00:01, xdelay=00:
00:01, mailer=relay, pri=30057, relay=[127.0.0.1] [127.0.0.1], 
dsn=5.1.2, stat=User unknown
Oct 15 07:59:41 povoden sm-mta[5533]: i9F5xe0p005533: 
from=<root@povoden.cronon.org>, size=57, class=0, nrcpts=0, proto=
ESMTP, daemon=MSP-v4, relay=localhost [127.0.0.1]
Oct 15 07:59:41 povoden sendmail[5532]: i9F5xe3s005532: i9F5xe3t005532: 
DSN: User unknown

Now the hostname cronon.org does exist and is resolvable from this box 
(if u do host on it it will give u the ip).
Also the user sw@cronon.org exists - its the mailaddress I use to reeive 
mails and post on this list ;)
Also the hostname povoden.cronon.org is resolvable forwards and reverse.

And Sendmail Errorcode 67 don't tell me anything - nor does google :(
Does anyone in here know what could be wrong?

cheers
Sebastian