外贸方面向客户解释船期延误的官方信函怎么写

Dear XX
We are sorry to tell you that the shipment of XXX货物 will be delayed.
陈述造成延期的原因(比如 原料不过关,我们为了品质重新做货.）
The goods have to be made again beacuse there is something wrong with materials and we want to offer you good products with better quality.
After talking with our P.M,the new delivery time will be XXX新交期的时间.
We are very sorry for any inconvenience caused.