[sentinix-list] Sentinix & mail relay (spam)

Hi,
I enabled smtp/mail on my external Sentinix box. I assumed this must be enabled to get alerts from some of the applications.  Is it prone to being an open mail relay?

I ran a GFILANguard scan on the server and the app seems to think so: "SMTP server allows relaying"

Regards,
Will