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There were some unreported sms delivery issues with c9 yesterday Jun 1.
Between ~ 12:40 pm and 4:50 pm, sms messages sent at this time would not of been delivered.
Tracing the issue, it looks like a record # of messages have been sent in past couple of days and this tripped a circuit breaker with our SMS provider which their systems did not tell us or your c9 about in the way we assumed would happen.
Taking some feedback from our provider on how everything interconnects, we have made some changes to our SMS delivery system that will prevent this sort of thing happening again and should dramatically improve confidence in SMS delivery system.
From now on, if a SMS fails to deliver for any reason, including things like bad phone number or phone being switched off for a few days. Your c9 will now alert you via a SMS reply. SMS replies are normally replies from customers to you, but we are now also using this channel to alert for SMS delivery issues. To access replies goto contacts -> contacts -> replies. Example screenshot below
C9 only ever bills messages that have been acknowledged as being received by your customers phone and this has always been the case. We have now extended the technology a little bit to provide more useful feedback into your c9 for messages that failed to deliver.
Resending unsent messages
You can manually resend messages if you need to. Goto contacts -> contacts -> notifications. Look at all notifications sent between 12:40 pm and 4:50 pm on June 1st. even though SMS messages will say sent there is likely they were not delivered. Highlight each one you want to send and click 'resend'.