[BlueOnyx:05371] root can't send mail

[Gerald Waugh]

I have searched all over tried a dozen things
But when ever root attempts to sendmail I get errors like this on just one server.
I found this problem when investigating the lack of logwatch reports from this serverr

this test sent to me
echo "test" | mail -s test gwaugh at frontstreetnetworks.com'

Sep  9 10:14:53 s7 sendmail[25448]: o89HErwt025448: to=gwaugh at frontstreetnetworks.com, ctladdr=root (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30055, relay=[127.0.0.1] [127.0.0.1], dsn=5.0.0, stat=Service unavailable

echo "test" | mail -s test admin
Sep  9 10:19:11 s7 sendmail[25708]: o89HJAai025708: to=admin, ctladdr=root (0/0), delay=00:00:01, xdelay=00:00:00, mailer=relay, pri=30030, relay=[127.0.0.1] [127.0.0.1], dsn=5.0.0, stat=Service unavailable

ideas?

Gerald