这里需要(yào )说(shuō )明的是(shì ),在我们(men )系统(tǒng )里面如果单(dān )独设(shè )置(zhì )一个子域名(míng )解(jiě )析,比如(rú )将主(zhǔ )机(jī )名设(shè )置为(wéi )mail,单独(dú )解析到(dào )9,那么该解析(xī )记录(lù )优先泛(fàn )域名在实际(jì )使(shǐ )用中(zhōng )作用是非(fēi )常(cháng )广泛的,比(bǐ )如实现无限(xiàn )二级域名功能,提供免费的(de )url转发,在
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