这里需要(yào )说(shuō )明的是,在(zài )我们系统里(lǐ )面如果单(dān )独设置(zhì )一(yī )个子(zǐ )域(yù )名(míng )解析,比如(rú )将主(zhǔ )机名设置为mail,单独解(jiě )析(xī )到9,那么该解析记(jì )录优先泛(fàn )域(yù )名(míng )在实(shí )际(jì )使(shǐ )用中作用(yòng )是非常广泛(fàn )的,比如(rú )实(shí )现无限二级域名功能,提供免费的url转发(fā ),在
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