这里需(xū )要(yào )说(shuō )明的(de )是,在我们系(xì )统(tǒng )里面如果(guǒ )单独(dú )设置(zhì )一(yī )个子域(yù )名解(jiě )析,比如(rú )将(jiāng )主机名设(shè )置为mail,单独解(jiě )析到9,那么该(gāi )解析记录(lù )优先泛域名在实际使用(yòng )中(zhōng )作用是非(fēi )常广泛的(de ),比如(rú )实现无限二级域名功(gōng )能(néng ),提供(gòng )免(miǎn )费的(de )url转发,在
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