这里(lǐ )需要(yào )说明的(de )是,在我(wǒ )们系(xì )统里面如果(guǒ )单独设(shè )置一(yī )个子域名解(jiě )析,比(bǐ )如将(jiāng )主机名(míng )设(shè )置为mail,单(dān )独解析到(dào )9,那(nà )么该解析记(jì )录优(yōu )先泛(fàn )域(yù )名在实际(jì )使用中作用是非常广(guǎng )泛的,比如(rú )实现无限(xiàn )二级(jí )域(yù )名功能,提供免费的url转发,在
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