这里(lǐ )需要说明的是,在(zài )我们系(xì )统里面(miàn )如果单独设(shè )置一(yī )个子(zǐ )域名解析,比如(rú )将(jiāng )主(zhǔ )机名设(shè )置为mail,单独解析到(dào )9,那(nà )么(me )该(gāi )解(jiě )析(xī )记录优先(xiān )泛域名在实际使用(yòng )中作(zuò )用是(shì )非(fēi )常广泛(fàn )的,比如实现无限二(èr )级域(yù )名功能,提供免费的url转发(fā ),在
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