Error 63033
Product: Programmable SMS
ERROR - 63033
Recipient blocked to receive message
Recipient blocked to receive message
For WhatsApp, messages sent to numbers which have blocked the WhatsApp Sender will not error. These messages will have a "sent" delivery status indefinitely. Old versions of the WhatsApp Business API that are no longer used today would return an error, but WhatsApp has since removed this functionality to protect user privacy.
Possible Causes
Recipient has blocked your number.
Possible Solutions
Skip sending messages to this user.