商务信函或商务函电还是很有讲究的，尤其是在尊贵的客户面前或者是接触不深，一定要谦虚谨慎。给你看篇例子： Promotion Lerrer 推销信函Dear Sirs, We have just introduced our new refrigerator to the market , and are enclosing sales promotional literature to give you full details No doubt your customers will appreciate the opportunity to purchase this fine product and with this in mind we are enclosing an order form for you to complete and return to us without delay You will received a special introductory discount of 10% which we can maintain until November 20 Yours faithfully , ( Signature ) 不过，对于熟悉的老客户，语气可以适当缓和，偏向口语化，具体的其他几位回答者所说的都可以。 供你参考！
千针坊丶
