Dear Mr.,
Please accept our heartfelt apologies for the late delivery of goods to your company.
The delay resulted from a minor malfunction in our inventory system. However, we have had it resolved now. Your shipment will be sent out this afternoon. We are sure you will get them tomorrow.
We hope that you will forgive our minor mistake and we can continue our cooperation.
Yours sincerely,
KS Co.
翻译：
亲爱的先生：
对于此次出货日期延迟，请接受我们真诚的道歉。
此次延迟是由于存货系统出了一点小故障，但是现在问题已经解决了。您的货我们将于今天下午发出。我们确信您能在明天收到货。
希望您能原谅我们小小的过失并且能够继续合作。
您真诚的，
KS
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