All networks in Kuwait are now filtering messages. In order to bypass filtering, all alpha sender IDs will be changed to a random international sender.
Additionally, if you are using your own international numeric senderID and sending any volumes of SMS to this carrier you will also need to rotate senderID's to avoid filtering.
As of 13/4/15 we are using Adaptive Routing in Kuwait so your message could be set over one of several routes we have, depending on which one is currently the best quality. Therefore you should not expect DLRs to be consistent, most of them will be missing as many carriers in Kuwait do not support handset DLRs.