这里需(xū )要(yào )说明的(de )是,在我们系统(tǒng )里面(miàn )如果(guǒ )单独设置一个子域(yù )名解(jiě )析,比如将(jiāng )主(zhǔ )机(jī )名设置为mail,单(dān )独解析到9,那么该(gāi )解析记录(lù )优先(xiān )泛域名在实际使用中(zhōng )作用是非(fēi )常(cháng )广(guǎng )泛(fàn )的(de ),比(bǐ )如实(shí )现(xiàn )无(wú )限(xiàn )二级域名功(gōng )能(néng ),提供免费的url转发(fā ),在
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