DLR Error Code 9 Illegal Number
What does it mean when I see a delivery receipt error code 9 in response to my outbound SMS?
- Outbound SMS
- Error Code 9
- Blacklisted Numbers
Error code 9 Illegal Number refers to messages sent to a blacklisted number where the user has explicitly requested to STOP receiving messages from a particular service.
See https://nexmo.zendesk.com/entries/20922283-What-happens-when-you-send-a-message-to-a-Barred-Number- for a query about an apparent ambiguity here.
Please send an email to email@example.com with details about the message/s in question and we will gladly investigate further, as it might be related to some kind of routing fault
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