这(zhè )里需要(yào )说明(míng )的是(shì ),在我们系统里面(miàn )如果单独设(shè )置一(yī )个(gè )子域名解(jiě )析(xī ),比如(rú )将(jiāng )主机(jī )名设置为mail,单(dān )独解(jiě )析到(dào )9,那么该(gāi )解析记录优(yōu )先(xiān )泛域名(míng )在(zài )实(shí )际使用中作用是(shì )非常广泛的,比如实现无限二级域(yù )名功能(néng ),提供(gòng )免(miǎn )费的url转发,在
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