SMSSentPostback

This is posted when we send a message to the aggregator for delivery. A value of 1 indicates success. A value of 0 indicates failure: the aggregator was not able to accept the message. Failure is most likely because the destination phone number is a landline. In case of failure, Esendex will retry the message automatically for a total of three times. After three failures, Esendex will cancel the message. Note that some upstream paths do allow text messages to go to a landline.

A unique identifier that matches the initial MessageID from your outgoing SMS.

This is populated if you set a reference ID in your outgoing request.

This is the number that sent your outgoing message.

This is the number you sent the SMS to.

UTC date when the message got sent out. Usually within a few seconds of the current time.