这里需要说(shuō )明(míng )的是(shì ),在(zài )我(wǒ )们系(xì )统里面如(rú )果(guǒ )单独设置(zhì )一个子(zǐ )域名解析(xī ),比(bǐ )如将(jiāng )主(zhǔ )机(jī )名(míng )设置为mail,单独解析(xī )到9,那么(me )该解(jiě )析记录优先(xiān )泛域名在实(shí )际使用(yòng )中作用是非(fēi )常广泛的,比如实现(xiàn )无(wú )限二级(jí )域名(míng )功能,提(tí )供免费的url转发,在
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