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- Sending SMS or Email are Async call , if format is valid it will return success , but later it will try to send it that might got failure.
- As SMS gate way will have api to check delivery reports : https://docs.msg91.com/collection/msg91-api-integration/5/delivery-report/T19VM23R
- In case of email how can we confirm delivery reports?
- What will happen if delivery reports indicates failure ?
- What should be frequency to get OTP delivery reports?