这里需(xū )要说明的是,在(zài )我们系(xì )统里(lǐ )面如果(guǒ )单(dān )独设置一(yī )个子(zǐ )域(yù )名(míng )解析,比如(rú )将(jiāng )主(zhǔ )机(jī )名(míng )设(shè )置为mail,单独解(jiě )析到9,那么该(gāi )解析(xī )记录优先泛域名(míng )在实(shí )际使用中(zhōng )作用是非(fēi )常广泛的,比如实现无(wú )限二级(jí )域名功能,提供免费的url转发(fā ),在
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