这里需要说(shuō )明的是,在我们系统(tǒng )里面如果(guǒ )单(dān )独设置(zhì )一个(gè )子(zǐ )域(yù )名(míng )解析,比(bǐ )如将(jiāng )主机名设(shè )置(zhì )为mail,单独解析到(dào )9,那么该(gāi )解(jiě )析记录优先(xiān )泛域名在实(shí )际使(shǐ )用中(zhōng )作(zuò )用是(shì )非(fēi )常广泛(fàn )的,比如实现无(wú )限二级域(yù )名功能(néng ),提(tí )供免费的url转发,在
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