Ok, thanks, Stan.
One other quick question, if you don't mind.
I entered the x-mailer: id for Outlook 2010, as shown below but the header for MBM keeps showing up, also. I just thought a regular Windows header may help deliverability; does it matter much, or should I just leave your default setting alone?
X-Mailer: MBM 8.3.3-US
X-Mailer: Microsoft Outlook 14.0