这里需要说(shuō )明的是,在我(wǒ )们系(xì )统里(lǐ )面如果单独设置一个子域名解(jiě )析(xī ),比(bǐ )如将主机名设(shè )置为mail,单(dān )独(dú )解(jiě )析到(dào )9,那(nà )么该解(jiě )析记录(lù )优先(xiān )泛(fàn )域名在实际(jì )使用中作(zuò )用是(shì )非(fēi )常广泛的,比如(rú )实(shí )现(xiàn )无限二级域(yù )名功能,提(tí )供免费的url转发(fā ),在
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