Get 4 email templates you can send out to customers when their order is delayed due to production issues. Use this letter template to let your customers know the items they've ordered are on back order and will be shipped as soon as possible.Give a genuine reason for missing out. Express properly (no word limit); Write in a way so that the reader understands. We've got you covered with 25 customer apology letter templates so you can swiftly say "I'm sorry" and start delivering a solution. Why am I receiving a backorder letter? You are receiving a backorder letter because the item you have requested is currently out of stock. In this article, we'll cover everything you need to know about writing apology letters and provide 5 templates you can use to get started today. Example: "We truly regret any inconvenience this has caused you. It was our mistake and we take full responsibility for it.