To blacklist multiple contacts that you import from a .csv file:
1. Create a new list on the People page:
2. Open the Import from CSV dialog window and follow the procedure.
3. On the Review & Import step, select the list you have created:
4. Click Import. This action imports contacts from your .csv file to Reply.
5. Open the list with the imported contacts.
6. Select all contacts in the list:
7. In the More drop-down menu, click Blacklist:
8. In the popup window, click Blacklist xxx contacts: