smtp test returns syntax error

[Bill Wagner <william.wagner (at) ipacc.com>]

I have xymon 4.2.3 on solaris and running smtp test on several servers 
on a variety of platforms.   All show 'green' status, smtp ok.  However 
when I review the details I see the following:

501 5.5.2 Syntax error in parameters scanning ""

I am also using Big Brother to monitor while I transition to xymon.  BB 
does not report the same syntax error.

Any ideas on how to troubleshoot this?  I am simply using the keyword 
'smtp' in my bb-hosts file on both BB and xymon.

Thanks in advance.

Bill