My client want to only allow theiremail domain @abc.com send to @xyz.com (Partner company)
@abc.com user cannot email email to any other external address except @xyz.com
Transport Rule is set as below
Form a member of Distribution list
and send Delivery not authorized, message refused to sender with 5.7.1
except when the text "to" appears in a xyz.com
1. User send an email to yahoo.com -- denied
2. User send an email to xyz.com -- allowed
3. User send an email to yahoo.com and to xyz.com - email sent out.
How to deny test result 3?