This script is Copyright (C) 2005-2011 Tenable Network Security, Inc.
An SMTP server is listening on the remote port.
The remote host is running a mail (SMTP) server on this port.
Since SMTP servers are the targets of spammers, it is recommended you
disable it if you do not use it.
Disable this service if you do not use it, or filter incoming traffic
to this port.
Risk factor :