Use this letter template to let your customers know that items they've ordered are on backorder and will be shipped as soon as possible. Here's the best practices for sending an outofstock email, as well as an outofstock email template to bookmark.This document outlines the backorder process. When sending an email inquiring about an order that has not yet shipped, it's important to maintain a polite and professional tone. Know your audience: Understanding who exactly you're writing to can help you best tailor your email to be most informative. Re-engage your audience using 9 effective win-back templates. Discover the importance of customer retention and win-back campaigns for long-term success. Copy and customize these customer support email templates for your own CS team to answer and resolve customer issues faster. Add the body of the email in the Message Template area, see the example below. The next thing you need to do is to provide an estimated delivery date for the backordered or outofstock items.