这里需要说明的是,在我(wǒ )们系统里面如果(guǒ )单(dān )独设(shè )置一个子域名解析(xī ),比如(rú )将(jiāng )主(zhǔ )机名(míng )设置为mail,单(dān )独(dú )解(jiě )析(xī )到(dào )9,那么该(gāi )解析(xī )记录优(yōu )先(xiān )泛域名在(zài )实际使用中(zhōng )作用是(shì )非常广泛的,比如(rú )实现无(wú )限二级(jí )域(yù )名(míng )功能(néng ),提供免(miǎn )费的url转发(fā ),在
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