这里需要(yào )说明的(de )是,在(zài )我们(men )系(xì )统里面如(rú )果(guǒ )单(dān )独设置(zhì )一个子域名(míng )解析,比(bǐ )如(rú )将(jiāng )主机名设(shè )置为mail,单独解(jiě )析(xī )到9,那么该(gāi )解析记录优先泛域(yù )名在(zài )实际(jì )使用中作用是(shì )非(fēi )常广泛的,比如(rú )实现无限二级域名(míng )功(gōng )能(néng ),提(tí )供(gòng )免费的url转发,在(zài )
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