Can I reply to customers who have opted out?

Mobile subscribers who reply with a "STOP" message to your Plivo number are considered opted out. Any subsequent SMS messages to these phone numbers are blocked by Plivo. If you attempt to send messages to an opted-out customer, these messages will be marked failed with error code 200. 

However, you may acknowledge the receipt of a "STOP" keywords from a customer to let them know that they've been opted out. Plivo allows you to send outbound messages to opted-out customers with the following conditions: 

  • The acknowledgment SMS message should be sent within five minutes of receipt of the "STOP" keyword from the subscriber.
  • At most, one SMS message is allowed to be sent to opted-out customers.  


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