mail command on sco box

Hello,
Can anyone tell me why the command below will not work on a SCO box, but does fine on aix, suse boxes. Thanks.

echo "test" | mail -s "Test" test@test.com

Course the email address I just faked out for sample purpose. I see from the it gives the following error below. I also changed specific company email address to just test. Thanks for any help. Bill

From <> Fri Aug 17 15:21:36 2007
From: MMDF Mail System <mmdf@test.test.com>
To: root@test.test.com
Subject: Failed mail
Date: Fri, 17 Aug 2007 15:21:36 -0500 (CDT)
Message-ID: <200708171521.aa11459@test.test.com>
Status: R

Trouble sending mail on test.test.com:

============ Transcript follows ============

Unable to parse address
Submit error: No valid addresses

============== Message follows =============
From: root@test.test.com (Superuser)
X-Mailer: SCO OpenServer Mail Release 5.0.7
To: test.test@testme.com
Subject: test
Date: Fri, 17 Aug 2007 15:21:36 -0500 (CDT)