On the Mobile Device:
Slide Screens to the left.
Annotations appear under the phone frame
Reply To Personalized List Only
1. Edit Personalized List
Tap Pencil icon to edit Personalized List
2. Add contacts or groups of contacts
Choose Single contacts one by one or group of contacts
3. Add Personal Message
Write personal message and click ok button
4. Reply to Personalized List Only
On the app' Setting screen check "Reply to Personalized List Only" This way reply will be sent ONLY to those who were added to personalized list.