现代企业之间竞争激烈,每个企业都在努力寻求高效低成本的宣传方式。很多企业会定期向会员寄发自己的会刊,这是邮政数据库营销的一个重要市场。这些会刊多采用套封式信函,内件一般为书籍、册子或单页、折页。然而这类形式单一的商业信函通常不被收件人重视, The competition among modern enterprises is fierce, and each enterprise is trying hard to seek effective and low-cost publicity methods. Many businesses send their members a regular newsletter, an important market for postal database marketing. Most of these bulletins use enclosed letters, usually within the pieces of books, brochures or single pages, folding. However, such forms of single business letters are usually not the attention of the recipient,