# Notification API status codes
**URL:** https://community.yellow.ai/t/notification-api-status-codes/3331
**Category:** Engage
**Tags:** notification-api
**Created:** [January 3, 2023, 2:59pm UTC](https://community.yellow.ai/t/notification-api-status-codes/3331 "2023-01-03T14:59:42Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@RamachandraReddy](https://community.yellow.ai/u/RamachandraReddy)
#### Post date: [January 3, 2023, 2:59pm UTC](https://community.yellow.ai/t/notification-api-status-codes/3331/1 "2023-01-03T14:59:43Z")
I would like to know the difference between undelivered, not-sent, failed and delivered, sent status while sending SMS over notification api
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### Author:  [@gautham](https://community.yellow.ai/u/gautham)
#### Post date: [January 3, 2023, 3:16pm UTC](https://community.yellow.ai/t/notification-api-status-codes/3331/2 "2023-01-03T15:16:57Z")
You can refer this doc to get better idea
> **[Outbound campaign report | yellow.ai](https://docs.yellow.ai/docs/platform_concepts/engagement/outbound/outbound-campaigns/outbound-report#2-email-report)**
>
> You can download comprehensive reports for all campaigns you send out from Yellow.ai’s Engage module. You can use these reports to analyze campaign performance and see the in detailed report of errors (if any).
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### Author:  [@RamachandraReddy](https://community.yellow.ai/u/RamachandraReddy)
#### Post date: [January 5, 2023, 11:30am UTC](https://community.yellow.ai/t/notification-api-status-codes/3331/3 "2023-01-05T11:30:05Z")
Thank You @gautham
this doc covers failed, delivered, and sent.
But we would like to understand the difference between not-sent, undelivered, and failed also.