If you get a status code of 200 back
If you get a status code of 200 back from our API, it means your message has been queued for delivery. Whether or not it actually gets delivered is something you can only determine by watching your inbox for a non-delivery receipt. We will send an NDR if the message bounces for some reason. Otherwise, you can assume it got delivered. We only queue for up to six hours, so that's the maximum time you will have to wait to get an NDR.
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Here is the repo