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The short answer: when an SMS does not go out, we try twice more, 10 minutes apart. If it still fails, the message becomes failed and the credits go back to your balance. What your system does next is up to you: the most useful step is to send that notice through another channel, such as e-mail.
Refused at once, or failed later
A notice can miss its target in two ways, and each is handled differently:
| What happened | How you see it | What to do |
| Refused on request | The API answers 422 with the reason in details.reason (invalid_number, number_opted_out, insufficient_credits, daily_limit_reached, sender_not_approved…) | Fix the cause. Repeating the same request gives the same error. |
| Accepted, but not sent | The status becomes failed, with the error delivery_failed | Notify through another channel, or review the customer's number. |
| Scheduled, balance short at send time | The status becomes failed, with the error insufficient_credits | Buy credits and schedule again. |
The full list of reasons is in SMS API errors and message statuses.
Falling back to e-mail, automatically
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| Do not resend the SMS in a loop. We have already retried. Repeating the request unchanged wastes requests, may use credits if the fault was temporary, and a wrong number stays wrong. |
Without coding
On the SMS page in My MozOut, filter the History by the Failed status. You see who it was for, the message and the date, and you can reach those customers another way. Filters and statuses are covered in SMS history and scheduling.
| Confirm numbers when you collect them. Most failures come from mistyped numbers or numbers no longer in use. A verification code at sign-up catches that early: verification codes through our API. |
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Want notices that never get lost on the way? See the API page. See the API page |
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