近年来，在众多的广告形式和促销手段中，商业信函十分引人注目。所谓商业信函，说白了就是邮寄广告，泛措那些投寄各种产品广告、货样、样照、彩图、合同、征订单、结算单等的信函。商业信函在国外非常流行，尤其是在西方发达国家，其发展势头十分强劲，其营业额已占五大广告 In recent years, commercial letters have attracted the attention of numerous advertising forms and promotions. The so-called commercial correspondence, to put it plainly is the mail advertisement, pan-measures those posting a variety of product advertising, sample, sample photos, color maps, contracts, requisitions, statements and other letters. Commercial letters are very popular in foreign countries, especially in the developed western countries, its development momentum is very strong, its turnover has accounted for five major ads