这里需要(yào )说明的是,在我们系(xì )统里面如(rú )果(guǒ )单(dān )独(dú )设置(zhì )一个(gè )子域名(míng )解(jiě )析,比如(rú )将主机名设置为mail,单(dān )独解析到9,那(nà )么该(gāi )解析(xī )记录优先(xiān )泛域(yù )名在(zài )实际使(shǐ )用(yòng )中作(zuò )用(yòng )是(shì )非常广泛的,比如实现无(wú )限二级域(yù )名功能(néng ),提供免(miǎn )费的url转发,在
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