When an SMS recipient replies with a STOP keyword:


1. The subscriber is added to the suppression list for the source number that was used to send out the SMS. 

Subsequent messages from that source number to the subscriber are blocked by Plivo. The SMS is marked as Failed with Plivo error code 200.

The block is removed only if the subscriber texts in an opt in keyword to the Plivo number.


2. If the SMS was sent via Powerpack, then the recipient's phone number is also added to the suppression list for the Powerpack. 

Subsequent messages from that Powerpack to the subscriber are blocked by Plivo. The SMS is marked as Failed with Plivo error code 200.

The Powerpack level block is removed only when the subscriber texts in an opt in keyword to any Plivo number associated with that Powerpack.